Can i put a 300 blackout upper

The .300 Blackout lower receiver is constructed of a trigger, disconnector, fire selector, magazine catch, and the hammer. The trigger assembly and the magazine are 2 of the most important components that are housed in a .300 Blackout lower receiver. A .300 Blackout receiver is secured to the upper receiver by 2 pins.

Can i put a 300 blackout upper. And here are 6 best 300 Blackout upper for AR-15 platforms. The 300 Blackout ballistic performance provides unique capabilities in scenarios that the 5.56 caliber bullet lacks. While most 9" 300 Blackout uppers are the best options for subsonic ammo, the user can convert their AR-15 into a short-barreled 300 Blackout rifle or pistol

2. Ruger American Ranch .300 Blackout. When we think of .300 Blackout, it’s natural to think of suppressed use. While the round was designed with AR-type rifles in mind, it’s become increasingly popular in a multitude of platforms, including bolt action rifles. (Photo: Ruger Forum)

Can I switch between 5.56 and 300 blackout on the same lower receiver? Yes, as long as the lower receiver is compatible with both calibers and you have the appropriate uppers and components, you can switch between 5.56 and 300 blackout. Do I need a special buffer or buffer spring when swapping AR uppers by caliber?Can I put a 300 blackout upper on a 5.56 lower? Yes, a 300 blackout upper can be used on a 5.56 lower with the appropriate conversion kit. Can I put a 6.5 Grendel upper on a 5.56 lower? Yes, a 6.5 Grendel upper can be used on a 5.56 lower with no issue.Jul 21, 2022 · 24. Learn what lowers and uppers are compatible with our AR-15 and AR-10 complete upper assemblies and lower receivers. As you’ve probably discovered, AR-15s can shoot a whole lot more than just 5.56 NATO: 300 Blackout, 350 Legend, 7.62×39, 458 SOCOM, and 6.5 Grendel to name a few. Thus, Lemar explains how to change the caliber of your AR-15 ... Due to the high volume of orders, please allow up to two weeks for delivery of firearms. Email: [email protected]. American Defense Mfg MOD2 M-LOK Upper Receivers (.300 Blackout) available in 10.5" pistol or 16" rifle, with Black, OD Green, Gray, Bronze, or Earth finish.I currently own an SBR registered as 10.5" BBL (29.5" OAL) 5.56, but am interested in getting a shorter-barreled (7.5"/8.5") upper in .300 BLK. My understanding is that I can swap uppers on the receiver at-will, provided I keep the parts (i.e. the 5.56 upper) available to return the SBR to its original, registered configuration.Apr 23, 2022 ... The Marauder from Palmetto State Armory is perhaps one of the most inexpensive ways to get into 300 Blackout, and it's in a pistol format.Thanks to the Internet, it’s easier than ever to watch your favorite shows. Fortunately, all you need is an Internet connection, and you can watch on your computer, handheld device...300 Blackout (9″ barrel, 125-grain) performance: 100″ drop at 410 meters. 41″ drift at 470 meters. 291 lb-ft. of energy at 625 meters. 440 meters max effective range. Although a 9" barrel provides good performance, you've probably seen builders opting for an even shorter barrel, around 7.5".

Feb 18, 2024 · Most 5.56 lowers are designed to accommodate other calibers such as .300 Blackout, 6.5 Grendel, and .22LR. However, it is important to check if the lower is compatible with the specific caliber before making any modifications. 1. Can I use a .300 Blackout upper on my 5.56 lower? Yes, as long as the lower receiver is designed to accept both ... Start your build off right with a 300 blackout upper from Palmetto State Armory. We offer AR-15 uppers in various barrel lengths and finishes to fit the needs of your build. We also carry 300 blackout kits, complete guns, and 300 blackout ammo. We have you covered with all things 300 blackout related. List View. Items 1 - 24 of 150. Depends on what the lower was manufactured as (rifle or pistol). Yes. There really isn't a '5.56 lower'. Its an AR-15 lower and all AR-15 uppers are supposed to work with it (subject to tons of exceptions due to differing specs but its the thought that counts). Now, the trick is not firing .300 through your 5.56 upper.If i have a 300 blk pistol, can I swap uppers with a jakl 556 upper? The lowers are sold as 556 and 300 blk, so seems theres some difference there? Thanks! kastaway81 January 26, 2023, 9:55pm 2. They are interchangeable. The lowers are all ar15 milspec compatible once you strip the good bits off.Velocity – The .300 Blackout offers a slower projectile than the 5.56 NATO—at equal distances, the former is always going to be moving slower than the latter. Drop – As a result of slower velocity, .300 Blackout drops faster than the 5.56 NATO. As a result, 5.56 shoots flatter for a longer distance. For long-range hunters, this is a ...Marmosets are some of the smallest monkeys in the world and are found primarily in the forested areas of central Brazil. And the males support their mates in a very unique way. Adv...

.300 Blackout Upper Receivers for the AR Platform. While the AR-15 was originally chambered in .223/5.56 NATO, the platform has grown significantly since its introduction in 1959. Today’s shooters have numerous calibers to choose from, and .300 Blackout is one of many high-powered options available to today’s marksmen.Mar 24, 2016 · If you want to try to change your 5.56 to 300 all you will need to do is just change barrels. However, changing barrels requires a couple special tools if you want to make the job easier so there would be an investment in buying the tools. The magazines will work for both 5.56 and 300. The bolt is the same too. Which lead me to purchase an RF 16" 300 blk upper (4150 with pistol length gas). Holy crap again. I put that on a simple Anderson Lower I put together and the two happen to fit like they were made for each other. At 100 yards I'm 1 MOA about half the time using a cheap UTG 3-12 first focal plane scope and I'm NOT a highly skilled ...About the BCM® Standard 9" 300 BLACKOUT Complete Upper Receiver w/ MCMR-8 Handguard. Continuous taper barrel profile designed for optimal weight, balance, and performance. Barrel profile fluted toward the rear near chamber area - Increases strength and heat dissipation. Tapered barrel profile out front, for easier …

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.300 Blackout Upper Receivers for the AR Platform. While the AR-15 was originally chambered in .223/5.56 NATO, the platform has grown significantly since its introduction in 1959. Today’s shooters have numerous calibers to choose from, and .300 Blackout is one of many high-powered options available to today’s marksmen.But the answer you certainly can put the Complete 300 aac (Blackout Upper) on your DPMS WARNING So, get your 300 aac Upper and put it on your Lower. 300BLK ...Apr 23, 2022 ... The Marauder from Palmetto State Armory is perhaps one of the most inexpensive ways to get into 300 Blackout, and it's in a pistol format.Davidson Defense 'Mercs' 16" AR-15 .300 Blackout Manganese Phosphate Upper Build Kit. $539.99$224.99Sale. In Stock. Select Options. Quick View. Davidson Defense 'Nexuiz' AR-15 Upper Receiver 16" .300 Blackout 4150 CMV 1-8T Heavy Barrel 13" M-Lok Handguard. $529.99$214.99Sale. In Stock. Select Options.Mar 8, 2023 ... Not tooless adjustable, and the shortest barrel length is still 10 inches for 300blk, come on Brownells you are so close to greatness.

Mar 24, 2016 · If you want to try to change your 5.56 to 300 all you will need to do is just change barrels. However, changing barrels requires a couple special tools if you want to make the job easier so there would be an investment in buying the tools. The magazines will work for both 5.56 and 300. The bolt is the same too. Compatible calibers include .223 Remington, 5.56 NATO, .300 AAC Blackout, and 6.5 Grendel. Can I use a 6.8 SPC upper with a .223 lower receiver? Yes, a 6.8 SPC upper can be used with a .223 lower receiver with the proper magazine and bolt. What is the process for swapping out an upper receiver?If you are going to run a 16 inch barrel AR just get an LWRCI SIX8 rifle which puts out 1612 ft/lb of energy with 120 gr SST from Hornady vs using 110 gr 300 BLK out of 16 inch gives you 1421 ft/lb. Yeah you make a bigger hole with a 30 cal but you have more energy in the 6.8 SPC. If you want the bigger hole AND energy get a SCAR 17.Dec 2, 2016 · Sonny82. 118 posts · Joined 2016. #4 · Dec 2, 2016. I would suggest getting a dedicated BCG and CH for your 300 upper. This will avoid any unwanted issues. I have put a bcg from one AR into another to test fire but it isn't recommended without checking the headspace. For around another $100 you could purchase a BCG and CH from PSA and be set. Blackout curtain liners are a great addition to any room, providing privacy and blocking out unwanted light. However, in order for them to fit perfectly and do their job effectivel... An AR15 would be a short action, because the .300BLK is designed using similar dimensions to 5.56mm casings, but the AR10 with the .308 is the long action, because the casing is longer. Because the .308 is longer, the whole lower is longer, and the pins will not line up. Look up "5.56mm vs .308" in Google images. Reply. The .300 Blackout round can indeed be fired using an AR-15 lower receiver, provided that it has been modified with a .300 Blackout upper receiver, magazine, and barrel. This allows for compatibility between the two, making it a popular and versatile option for AR-15 owners. Recommended Steps: Acquire a high-quality .300 Blackout barrel compatible with your AR-15 upper receiver. Choose a reputable manufacturer to ensure reliability and performance. Gather specialized armorer tools, such as an armorer's wrench and a punch set, for the conversion process. 300 Blk is a derivative of the .223 cartridge, so naturally it uses the same bolt and magazines. With the AR-15, if it fits in the magwell, they can probably chamber it. The exception is if the cartridge doesn't use the magwell, or it's mag well attached to the upper receiver, then it's possible to go up to .50 bmg, a muzzle loading barrel , and even a …The Upper East Side of New York City is known for its bustling streets, upscale shops, and world-class museums. However, finding parking in this busy neighborhood can often be a da...

BC-15 | .300 Blackout Upper | 16” Parkerized Heavy Barrel | 1:8 Twist | Carbine Length Gas System | 15” MLOK. 146 Reviews. $197.99 $219.99. Add to Cart. BC-15 | .300 Blackout Right Side Charging Upper | 16" 416R SS Black Nitride Bear Claw Fluted Heavy Barrel | 1:8 Twist | Carbine Length Gas System | 11.5" MLOK.

Feb 18, 2024 · 8. Can I put a .450 Bushmaster upper on a .556 lower? Yes, a .450 Bushmaster upper can be used on a .556 lower with a specific magazine and bolt. 9. Is it possible to switch to a 300 Blackout upper on a .556 lower? Yes, a 300 Blackout upper can be used on a .556 lower with no issues. 10. Can I use a 7.62×51/.308 upper on a .556 lower? M4E1 Enhanced 10" .300 Blackout Complete Upper Receiver. $615.00 - $655.00. Out of stock. Only %1 left. Add to Wish List. Subscribe to back in stock notification. Subscribe. Add to Wish List Added. Compare Added. ... 10" .300 Blackout Barrel Features: Length: 10" Twist: 1 in 7; Muzzle: 5/8x24 Threaded;Home. 300 Blackout Upper. How To Build A 300 Blackout Upper. By TS Editor / July 6, 2023. This guide goes over how to build a 300 Blackout upper for the AR15 platform. The process is exactly the same as building a upper for a 5.56 AR15 upper. The only difference is the barrel chamber and muzzle device.Upper left side back pain can be caused by acute pancreatitis, Healthline says. Although the pain manifests mostly in the upper left side of the abdomen, it can spread to the left ...Most 5.56 lowers are designed to accommodate other calibers such as .300 Blackout, 6.5 Grendel, and .22LR. However, it is important to check if the lower is compatible with the specific caliber before making any modifications. 1. Can I use a .300 Blackout upper on my 5.56 lower? Yes, as long as the lower receiver is designed to accept both ...Converting between the two cartridges is essentially the same thing whichever way you go. You need a different barrel, the correct gas tube for the new barrel, and maybe a new gas block if you don’t want to reuse the other one. If you haven’t gone through thousands and thousands of rounds of the original caliber, the bolt you have should be ...Here I show how to install a barrel on an AR15 upper receiver in my 300 Blackout build. I now know the value of roll pin holders, that gas tube roll pin was ...Method 1: Changing the Existing AR-15 Upper Receiver. The simplest approach to converting your AR-15 to .300 Blackout is by swapping out the entire upper receiver. This method allows for a quick and straightforward transformation, saving you time and effort. Recommended Steps:

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Thanks to the Internet, it’s easier than ever to watch your favorite shows. Fortunately, all you need is an Internet connection, and you can watch on your computer, handheld device...By TS Editor / July 6, 2023. This guide goes over how to build a 300 Blackout upper for the AR15 platform. The process is exactly the same as building a upper for a 5.56 AR15 …While they are similar, the upper torso and the chest are not the same thing. The upper torso is considered to be anything above the waist and below the neck, including the shoulde...300Blk uppers for AR15 in a wide range of Cerakote colors like FDE and OD Green are available from Always Armed. 300 BLK AR uppers are the top choice for your next hunting AR15. Using the standard 5.56 bolt carrier group, the .300 Blackout uppers are the go to pick when AR builders are looking for a new caliber in their AR-15 as they can be ...Of the three candidates you mentioned, I would think that 300BLK (especially subsonic flavor) would be the gentlest on the lower, followed by 7.62x39. Because 9mm is blowback, there is a lot of reciprocating mass that puts a lot of stress on the fire control pins and the area below the threads for the buffer tube.The Radian Weapons Model 1 300 BLK is built with high-quality materials (7075-T6) with CNC machining equipment. That includes its barrel that’s constructed from match-grade 416R stainless steel. It has a polished crown and feed ramps. The Radian Weapons Model 1 300 BLK upper receiver is also designed for both right and left …A couple reasons. First, it’s a blast to use suppressed. Second, good performance without being too obnoxiously loud at 7-10 inch barrel lengths. Third, is more 2nd hand knowledge from ex military using them for HD (supers) cuz they’ve seen the limitations of 556 in real life vs theoretical ballistics.And here are 6 best 300 Blackout upper for AR-15 platforms. The 300 Blackout ballistic performance provides unique capabilities in scenarios that the 5.56 caliber bullet lacks. While most 9" 300 Blackout uppers are the best options for subsonic ammo, the user can convert their AR-15 into a short-barreled 300 Blackout rifle or pistol ….

M4E1 Enhanced 10" .300 Blackout Complete Upper Receiver. $615.00 - $655.00. Select Your Finish Anodized Black. Handguard. Out of stock. Subscribe to back in stock notification. Subscribe. Add to Wish List. Compare.UPR-15 UPPER. Rated 4.93 out of 5 based on 28 customer ratings. ( 28 customer reviews) $ 1,250.00 – $ 1,850.00. As low as $45.18/month with . Learn More. The Uintah Precision UPR15 is a true bolt action upper for your mil-spec AR15 lower. The UPR15 brings the accuracy of a bolt action rifle to the most popular platform in the United States ... Depends on what the lower was manufactured as (rifle or pistol). Yes. There really isn't a '5.56 lower'. Its an AR-15 lower and all AR-15 uppers are supposed to work with it (subject to tons of exceptions due to differing specs but its the thought that counts). Now, the trick is not firing .300 through your 5.56 upper. Due to the high volume of orders, please allow up to two weeks for delivery of firearms. Email: [email protected]. American Defense Mfg MOD2 M-LOK Upper Receivers (.300 Blackout) available in 10.5" pistol or 16" rifle, with Black, OD Green, Gray, Bronze, or Earth finish.For five years, Chip and Joanna Gaines dominated HGTV with the popular home remodeling series known as Fixer Upper. In that time, they transformed old — sometimes condemned — homes...Converting between the two cartridges is essentially the same thing whichever way you go. You need a different barrel, the correct gas tube for the new barrel, and maybe a new gas block if you don’t want to reuse the other one. If you haven’t gone through thousands and thousands of rounds of the original caliber, the bolt you have should be ...Check Price. The PSA AR-15 Lower Receiver Safe/Fire gets a lot of praise for being a quality framework at a great price. The forged Mil-Spec lower is constructed from high-quality 7075-T6 aluminum. It has its fire selector marked “Safe” and “Fire” and is coated with a black hard-coat anodized finish.Nov 11, 2023 ... ... can be expected to perform out of your short ... - AAC 9" 300BLK upper with 1/9" twist barrel ... 300 Blackout Zero for Subs & Supers.One of the most common causes of thigh pain is muscle strain, according to WebMD. Less common causes include vascular disease, blood clots and arthritis. Some causes of upper thigh... Can i put a 300 blackout upper, 2. Ruger American Ranch .300 Blackout. When we think of .300 Blackout, it’s natural to think of suppressed use. While the round was designed with AR-type rifles in mind, it’s become increasingly popular in a multitude of platforms, including bolt action rifles. (Photo: Ruger Forum), Nov 24, 2020 ... Your browser can't play this video. Learn more ... 300 AAC Blackout vs 5.56 (Which is better for YOU?) ... Which barrel length is best for an AR-15?, Jul 5, 2023 · The easiest way to convert an existing AR15 into a 300 Blackout AR15 is to swap the entire upper receiver. There are many pre built 300 blackout upper receiver on the market. While the 300 Blackout performs the best with a 9" barrel along with suppressor use. , Apr 23, 2022 ... The Marauder from Palmetto State Armory is perhaps one of the most inexpensive ways to get into 300 Blackout, and it's in a pistol format., No, converting a .300 Blackout firearm to shoot 5.56 ammo would require significant modifications and should not be attempted without professional gunsmithing. 4. What happens if I shoot 5.56 ammo in a .300 Blackout? Firing 5.56 ammo in a .300 Blackout can cause dangerous malfunctions and potentially catastrophic damage to the firearm. 5., Yes, the only parts that change from 5.56 to 300BLK is the barrel and the muzzle device (5/8-24 threading vs 1/2x28). All other parts will be compatible. So it’s as easy as putting the upper on and pushing the take down pins in. If im not mistaken, that is exactly what .300 blackout was designed for., May 27, 2019 · Smoke. The .223/5.56 case is almost the same as the .300 Blackout. The .300 Blackout is just a little shorter & opened up to hold a .308 projectile. If you have .223/5.56 cases you can cut them off at the shoulder, lube them up & run them through a .300 Blackout sizing die to make the .308 neck, then cut to length. , You can put different uppers, such as a 300 Blackout, 6.5 Grendel, or 6.8 SPC, on a .556 lower to change calibers. See 3,000+ New Gun Deals HERE. 1. Can I …, This is an exclusive AR-15 upper made from Brownells. This 300 Blackout upper receiver contains a 16-inch 1:8 twist barrel. The A3 13-slot aluminum flat top receiver is standard and includes a 10” handguard, utilizing the KeyMod rail system. It has a phosphate finish to withstand corrosion and dirt., Feb 16, 2023 · For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8″-10″. Attaching a 6″ suppressor to this barrel length results in a total length of 14″ to 16″, which provides optimal muzzle velocity for accurate long-range shots. For longer range engagements with a suppressed 300 Blackout, use a 16″ barrel ... , 300Blk uppers for AR15 in a wide range of Cerakote colors like FDE and OD Green are available from Always Armed. 300 BLK AR uppers are the top choice for your next hunting AR15. Using the standard 5.56 bolt carrier group, the .300 Blackout uppers are the go to pick when AR builders are looking for a new caliber in their AR-15 as they can be ..., Due to the high volume of orders, please allow up to two weeks for delivery of firearms. Email: [email protected]. American Defense Mfg MOD2 M-LOK Upper Receivers (.300 Blackout) available in 10.5" pistol or 16" rifle, with Black, OD Green, Gray, Bronze, or Earth finish. , Hornady’s 135-grain FTX .300 Blackout load, for example, leaves the muzzle at 2,085 fps carrying 1,303 ft.-lbs. of energy. The company’s Critical Defense offering in .223 Rem. has a 73-grain FTX bullet. When it leaves the average AR-15 at 2,790 fps it’s generating 1,262 ft.-lbs. of knockdown power. Numbers vary by manufacturer, …, Yes, the only parts that change from 5.56 to 300BLK is the barrel and the muzzle device (5/8-24 threading vs 1/2x28). All other parts will be compatible. So it’s as easy as putting the upper on and pushing the take down pins in. If im not mistaken, that is exactly what .300 blackout was designed for., Feb 18, 2024 · 8. Can I put a .450 Bushmaster upper on a .556 lower? Yes, a .450 Bushmaster upper can be used on a .556 lower with a specific magazine and bolt. 9. Is it possible to switch to a 300 Blackout upper on a .556 lower? Yes, a 300 Blackout upper can be used on a .556 lower with no issues. 10. Can I use a 7.62×51/.308 upper on a .556 lower? , Let's be honest, a 300 BLK isn't a high horsepower round to begin with. It's 100% a compromise designed to get a .308 cal bullet moving at a subsonic velocity in a AR-15 platform, anything more than that and the compromises start stacking up. You can load it as a supersonic but it's still not up to 30-30 levels., Since your S&W lower was shipped as and marked as a rifle, make sure that whatever you put on the top continues to qualify the firearm as a rifle. If it becomes a pistol or an AOW as a result of the change, it would likely be an illegal combination. Again, turn to the upper's manufacturer for their confirmation that it remains legal on a rifle ..., Check Best Price. Popular BCM 300 Blackout Upper 9" Check Best Price. The easiest way to convert an existing AR15 into a 300 Blackout AR15 is to swap the …, Lower parts kit. Trigger assembly. Buffer assembly. Bolt carrier group. Upper receiver. Handguard. Magazine. These are the only parts that are exclusive to .300 BLK: Barrel. …, 300Blk uppers for AR15 in a wide range of Cerakote colors like FDE and OD Green are available from Always Armed. 300 BLK AR uppers are the top choice for your next hunting AR15. Using the standard 5.56 bolt carrier group, the .300 Blackout uppers are the go to pick when AR builders are looking for a new caliber in their AR-15 as they can be ..., This makes for a slower, more suppressor-friendly round. The short, stubby round, the .300 BLK, gives you improved performance over the 7.62x39mm at 300 yards. And at close range, the 5.56mm, frankly, is an awful round. There’s a good reason that Colt made ARs in 9mm going back into the Vietnam era., It is, however, limited in range. If you’re shooting super-sonic ammo, it’s not unreasonable to expect .300 BLK to reach out to at least 200 yards. But if you’re being quiet and using sub-sonic ammo, you can expect more like 100 yards. Size differences between 5.56 NATO, .300 BLK, and the 6.5 Grendel. This does make for a fantastic home ..., Blackouts in humans are caused by traumas, substances and diseases, according to Better Medicine. A blackout is defined as a period of unconsciousness or memory loss, and it can be..., Yes, a .300 blackout upper can be used with a 5.56 lower with the appropriate magazine and bolt. Can you put a 7.62×39 upper on an AR-15 lower? Yes, a 7.62×39 upper can be used with an AR-15 lower if it is designed to accommodate this caliber. Can a pistol upper be put on a rifle lower? No, a pistol upper cannot be put on a rifle lower ..., We demonstrate what happens if you accidently chamber a 300 blackout round in a 5.56 rifle., UPR-15 UPPER. Rated 4.93 out of 5 based on 28 customer ratings. ( 28 customer reviews) $ 1,250.00 – $ 1,850.00. As low as $45.18/month with . Learn More. The Uintah Precision UPR15 is a true bolt action upper for your mil-spec AR15 lower. The UPR15 brings the accuracy of a bolt action rifle to the most popular platform in the United States ..., Can I put a 300 blackout upper on a 5.56 lower? Yes, a 300 blackout upper can be used on a 5.56 lower with the appropriate conversion kit. Can I put a 6.5 Grendel upper on a 5.56 lower? Yes, a 6.5 Grendel upper …, .300 Blackout Upper Receivers for the AR Platform. While the AR-15 was originally chambered in .223/5.56 NATO, the platform has grown significantly since its introduction in 1959. Today’s shooters have numerous calibers to choose from, and .300 Blackout is one of many high-powered options available to today’s marksmen., Features. Barrel: 7.5" Chambered in 300AAC Blackout, with a 1:8 twist rate, M4 barrel extension, and a pistol length gas system. This phosphate barrel is finished off with a PSA 7" Lightweight M-Lok free-float rail, .750" diameter low profile gas block, and an A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat ..., Jun 15, 2018 ... We demonstrate what happens if you accidently chamber a 300 blackout round in a 5.56 rifle ... Your browser can't play this video. Learn more., This upper is a great deal that can save ... In this part of the AR15 300 blackout build we put together the stripped lower (dust cover and the forward assist). This upper is a great deal that can ..., Wy4tt Discussion starter. 398 posts · Joined 2014. #1 · Feb 19, 2019. I’m piecing together a AR pistol build I’m 300 AAC, and wondering if anyone has tried the 7.5” 300 blackout complete uppers from PSA. They’re looking good with key mod hand guard and all you need for $270-$370., The .300 Blackout round can indeed be fired using an AR-15 lower receiver, provided that it has been modified with a .300 Blackout upper receiver, magazine, and barrel. This allows for compatibility between the two, making it a popular and versatile option for AR-15 owners.