20 300 blackout upper 20 300 blackout upper

.300 Blackout Complete Uppers .300 Blackout Barrels AR 9MM 9MM Rifle Kits 9MM Pistol Kits 9MM Complete Uppers 9MM 80% Lowers 9MM Uppers 9MM Barrels 9MM Parts Handguns 1911 G19 Accessories & Optics Jigs My account Cart. BCM BFH 16" Mid Length (Light Weight) Upper Receiver Group w/ MCMR-15 Handguard $780.00 Out of Stock. At a mere 200 yards with a 100 zero, the 300 Blackout drops nearly 5.5 inches more than the 5.56, at 300 yards it drops a whopping 19-inches more. Whether you're a beginner or an expert, DSG Arms has the complete upper assembly for you. And now I hope to answer some of yours! I have a Radial 8.5" 300blk and it is a nice tight fit on a Areo M4E1 (No need for tension set screw) It shoots straight out to 50yds/ 1.5" group free standing, bench rest 100yds / 3.5" group but I blame the shooter. Still need? Learn the 3 most popular shooting stances & more. The lightweight aluminum handguard (M-Lok compatible) is a nice touch, lightening the load if you're thinking about stalking deer. All our side charging and standard charging 300 blackout uppers are compatible with mil-spec AR-15 lowers and come with a limited lifetime warranty. Select options. The short, stubby round, the .300 BLK, gives you improved performance over the 7.62x39mm at 300 yards. Your Price: $450.49. Thanks for subscribing to our newsletter! This page was last edited on 20 November 2022, at 17:47 (UTC). Interested in a one-stamp, integrally-suppressed blackout upper. Besides the easy conversion between 5.56 and .300 BLK, the .300 BLK does a lot the 5.56 can't. First off, it's a very versatile load with projectiles weights ranging from 110 grains to 220 grains. That means if you went with an under 16-inch barrel (which you pretty much gotta do with a .300 BLK), then you can get a folding brace for a super compact AR. .300 Blackout AR-15 Upper Builds - Davidson Defense I list the best choices in terms of value, performance, design, and cost. The fit on a variety of lowers was tighter and had less play than pistol uppers that had been paired with their lowers from the factory impressive! our price: $369.99 . I saw the 300BLK fire from the 5.56 chamber rife, What would happen if you fire a 5.56 from a 300BLK rife. The 300 Blackout AAC Rifle Assembled Upper Receivers come in 16" Barrel Length. Best 300 Blackout Lower [2022 Review] - Reload Your Gear What to look for in a Quality .300 Blackout Upper, Aero Precision M4E1 Assembled Upper Receiver, A Ballistic Comparison of 5.56x45mm vs. .300 AAC Blackout, The American Firearms Guide to Shotgunning. If you want to get a little pickier, go with an adjustable gas block or one that's long enough to allow you to slide an adjustable gas gadget under the hand guard and that pokes out a little to let you adjust it. Description. Why don't people build 300 blackout piston driven rifle like - reddit What handguard/upper is the bottom most picture with the 2 rifles? We sincerely value the suggestions and feedback of our visitors. Learn More. MCX VIRTUS UPPER ASSEMBLY - 11.5" 5.56 NATO $1,799.99 Add to Cart Restricted in some areas New! The .300 Blackout carries a .30-caliber bullet that offers greater mass than a .223 Remington's .22-caliber projectile. Shop our AR 15 complete uppers for sale for both gas operated and piston system uppers from top brands like Del-Ton, Bear Creek Arsenal, and Aero Precision. AR-15 Upper Assembly - 16 / 300 AAC / 1:8 - CBC Precision AR's A .300 Blackout pistol, with a suppressor, is still only about as long as an average AR15 without a suppressor, so it ends up a really handy package overall, which is one of the things that we like about the round. 300 Blackout Upper For Sale | Primary Arms 300 Blackout Rifle Uppers - Daytona Tactical Same story with my 16" rifle. As mentioned, this upper comes in two models: the 5.56mm and the .300 Blackout. .300 Blackout (BLK) vs. 5.56: What's Best For You? 300 blackout; 308 winchester; 450 bushmaster; 458 socom; 6.5 creedmoor; 6.5 grendel; 7.62x39mm; 9mm; . From 1930 to 1933, it was the regional subdivision of the Nazi Party in that area. Out of stock. Headspaced checked out good. New From SIG SAUER: Suppressed 300 Blk Upper Add to Cart. Radical Integrated Suppressed Uppers - Silencer Shop The same thing can be said for home defense in a .300-chambered AR replacing pistol caliber carbines lots more stopping power with little fuss. No BCG or Charging Handle required. Sale! Notify me of follow-up comments by email. 289 119. sale price: $319.99 (out . In Stock. If there is something we're doing well, something we can improve on, Legacy Reviews were written prior to the latest upgrade of our Review System. The Daniel Defense DDM4 300S was designed for operators demanding a short-barrel rifle chambered in the popular 300 Blackout cartridge. G19; 1911.300 Blackout.300 Blackout Complete Uppers . One such round is the .300 Blackout. 300 Blackout Upper Assemblies | Made in the USA - Pro2A Tactical This upper from the folks at Daniel Defense is certainly no exception to their quality. In standard 5.56mm, ARs will hit peak burn out of about a 16 barrel, with 14.5 as short as you can go with a 5.56 barrel and still get performant terminal ballistics, complete powder burn, and a lack of a fireball. For the best experience on our site, be sure to turn on Javascript in your browser. Flash hider, compensator, or suppressor, a shorter-barreled .300 Blackout rifle or pistol will benefit from some additional muzzle control. Another cool trick the Pro2A upper pulls off? The Faxon Firearms AR-15 Barrels .300 Blackout Gunner Profile comes in three distinct barrel lengths, two pistol barrels at 7.5 and 10.5 and a legal carbine 16 barrel. (, We noticed that you have previously logged in with your, Check what do you get by creating an account, Bookmark and compare your favorite firearms, While thats cool when it happens, whats even cooler is when rounds are, First off, its a very versatile load with, I wont dive too deep into the 5.56 vs. .300 Blackout debate because, A 10-inch barrel on an AR pistol or a short-barreled. When it comes to a bad-breath-distance engagement, we want a .300 blackout. The 5.56mm upper has a 10.5-inch barrel, while the .300 Blackout upper employs a 10-inch barrel (though, it utilizes a 1/2-inch longer suppressor core to even out the lengths between the two options). A subsonic round is much easier to suppress and much quieter when suppressed. Quick view Out of stock. if it doesn't engage the rifling it doesn't fly straight. Take deep dive into AR barrels with our barrel guide. AmmoFire - Best Place To Buy Ammo in United States. These 300 Blackout uppers all feature different-length handguards and are all equipped with a standard A2 muzzle brake that's been proven efficient and effective. LAR-9M 9mm Uppers. LAR-15M .300 AAC Uppers. . Very smooth and the accuracy is excellent with just irons. Your bolt carrier groups, upper and lower receivers, magazines, rails, and the like work just as well with the .300 BLK as your 5.56 NATO rounds. Uppers - Diamondback Firearms .300 BLACKOUT; 7.62x39; BARRELED UPPER (NO BCG/CH) 5.56 NATO.300 BLACKOUT; 7.62x39; SUPPRESSORS. My end use is a competition rifle pushing a 175 gn Sierra Matchking at 1900 fps or a 155 at 2100 fps with no suppressor. The .308 is a larger round, providing more energy and penetration than the .223/5.56 round. Radical firearms also produce their uppers in a wide variety of configurations. For pistol uppers, Palmetto State Armory has put together a sweet offering here. We may earn a commission on purchases from a link. . The store will not work correctly in the case when cookies are disabled. This time I checked out both a 9-inch barrel and a complete 10.3-inch BLK upper recommended by Clint Hanson. AR Uppers - Tactical Solutions Group LLC Aero Precision M4E1 Assembled Upper Receiver .300 BLK. upper and lower at a price cheaper than any previous AR Buildvery satisfied with the quality of each component. AR15Parts.com Our collection of 300 Blackout ACC uppers include Aero Precision uppers, Radical Firearms uppers, Ghost uppers, and tons of other AR upper receivers from the brands you know and love. 300 Blackout Upper - Complete 300 BLK Upper | AR15Parts.com Notify me of exclusive sales and special promotions. Add to cart. 300 Blackout Barrels | 300 ACC Blackout Barrels For Sale! - OpticsPlanet We all have a budget to live and die by, and recognizing that, Id suggest any of the .300 BLK options from Radical firearms. Primary Weapons Systems sells a complete upper exclusive on Brownells that is competitively priced compared to the others on this list, but you get a far superior action. Check. 300 blackout is designed as an SBR suppressed cartridge you have no need for a barrel longer than 16. I like the way these two set ups look. With this guide in hand and a little bit of thinking, youll be well on your way to an excellent .300 Blackout pistol or rifle. Complete Uppers So, in trying to develop a round that hits harder at short ranges, as well as suppresses supremely well, youll want to take a look at the .300 BLK. Results for 300blackout upper - OpticsPlanet CLICK HERE Texas independence day Sale ended ended 00hrs 00mins 00secs Since we think a high-quality .300 Blackout does so well suppressed, we think a pistol upper with a threaded barrel is the perfect way to get the best out of the round. Any u guys can recommend or recommend staying away from? Using standard 5.56mm magazines and bolts, the 300S is able to deliver .30 caliber ammunition with greater muzzle energy than comparable 5.56mm rifles. Just make sure and meet ATF's guidelines for AR-15 pistols. I agree extreme care and good organization are a necessity when dealing with uppers in multiple callibers but a .308 chambering in a .224 ? On a DD lower this thing is GREAT. This upper is ideal for tactical and hunting purposes. Nav Menu 5. Coupled with a LAW Tactical Folder, it fits nicely into my small trunk safe. You'll now receive newsletters of our best articles on techniques, I have one of these and wouldnt think twice about buying it again. Bushmaster has you covered on your next AR build or upgrading project chambered in 5.56mm, .300 Blackout, or 7.62mm. you a link to reset your password. Our AR15 300BLK uppers are made with high-grade material for the best performance and reliability. We hate SPAM and promise to keep your email address safe. The 16" barrel has a 1-8 twist rate and a Type 3 Hard Anodized - Black Finish. Tests by AAC way back in 2012 (and of course, ballistics have improved since then) demonstrated that the .300 BLK could still be effective out to 440 yards when fired from a barrel as short as 9-inches, making it ideal for use in AR pistols. 300 Blackout Upper | AR-15 300 Blackout | 300Blk Uppers - Always Armed A 10-inch barrel on an AR pistol or a short-barreled rifle is perfect for the .300 BLK. AR-15 UPPER RECEIVER ASSEMBLY 300BLK NO BCG - Brownells Market monitoring: Aero precision Upper complet 8'' pour carabine Semi LAR-15M 7.62x39mm Uppers. MEDIA; Nav Menu 3. Upper Builds > .300 Blackout Compatible. 2. Reviewed September 27, 2015 via mobile . Catastrophic failure!!! Brenton USA Guide 18in .300 AAC Blackout Upper Receiver $1,349.99 (Save 21%) $1,069.00 On Sale. - Free Float M . Out of stock. To round out our picks, we wanted something that would be especially suitable for a pistol built, and the Aero Precision M4E1 is awesome for that in the 8 barrel format. Pretty old article, all of the mentions of keymod give it away, as the industry has moved to the magpul standard m-lok. Handguard has a lot of cut-outs & could get warm. In addition, due to different content standards, we want to make sure our valued customers know these reviews had lesser requirements than reviews written today do. The new upper chambered in the ever-so-chic 300 blackout (300blk) fits the SIG MCX and a standard AR15 lower. Open. Review of Hotel Beer. MSRP: $529.99 |. You see, .300 BLK can chamber in most 5.56 barrels; however, if you try to shoot it your barrel (and sometimes more) will literally burst. guns & Please be cautious when considering offers from individuals offering you items. To be fair, we certainly like the 5.56mm: its a capable round thats lightweight, shoots reasonably straight out to about 500 yards, and has been getting the job done since Vietnam. LAR-47 Complete Upper Halves 7.62x39mm. FollowRadical Firearms on Twitter . AR-15 Complete Uppers | DSG ARMS With that said, weve had 50 years or so to optimize the system, and that is exactly what has happened with the .300 BLK round. Select options Quick View. Knowing the industry, there must be some amazing options on the market I simply havent seen. For more information, go to www.p65warnings.ca.gov. Quick view. Choose Options. Sale! Sort By: Ghost Firearms Elite 16" Upper .300 Blackout - Black $319.00 $249.00 Choose Options Ghost Vital 7.5" Upper .300 Blackout $299.00 $239.00 Choose Options The .300 Blackout was engineered from the ground up for the AR platform and it does not disappoint. Daniel Defense produces some of the best high-speed platforms to more than capable operators like the U.S. Navy SEALs. 300 Blackout Barrels for sale at Primary Arms from a variety of popular brands like BCM. The uppers all feature different-length handguards that accommodate the mounted flash suppressor. Law Tactical AR-15 Gen 3 Folding Stock Adapter. The M4E1 in .300 BLK comes available in 8-, 10-, and 16-inch barreled options. Home Default Category Upper Assemblies 300 Blackout. Ships out in 2 days on all Non-FFL items, 6 days for FFL items. INTEGRALLY SUPPRESSED . AR-15 Uppers Archives - Thunder Tactical MSRP: $449. English. I noticed that the rifle feeds better using tapco magazines but Ive had some success with my hexmags as well. Weve got a dedicated section for the AR-15 here. DS-15 Complete Upper 16" MOE .300 Blackout Threaded Black $ 599.95. My gunsmith is just finishing up my 20 inch 300 Whisper barrel. Check. Anything that makes them stand out? This AR15 upper receiver assembly comes ready to attach to any Mil-Spec lower receiver. Out Of Stock. Sale! In addition, the receiver itself is built out of 7075-T6 aluminum and has a hard-coated anodized finish. This pistol runs flawlessly. The .300 BLK also reaches peak ballistic potential from a 9-inch barrel. It may be on the heavier side because they like heavy barrel profiles, but there's Faxon with a pencil barrel if you want it to lose weight. 300 Blackout Barrels | Custom AR-15 Barrels | Wing Tactical I haven't had any issues with the 416 stainless barrel. BCM MK2 Upper Receiver Groups; 20" Rifle Upper Group; 18" SPR Mk 12 Upper Half; 18" Rifle Upper Group; 16" M4 Carbine Upper Group; 16" Mid Length Upper Group; Personally, I keep them organized by using different color mags FDE and black for 5.56 and Olive Drab for .300 BLK. Best .300 Blackout AR-15 Uppers On The Market 2023 - TheGunZone You will not have access to saved addresses or payment. Have been looking at all the AR variations and would like your thoughts/advice on a particular package I'd like to build - .300BO, 16" 1:8 barrel, gas piston, and side-charging upper. 300 Blackout Uppers | 300 ACC BLK Uppers from Top Brands like Aero Precision, Radical Firearms & More, 300 Blackout Uppers | 300 ACC BLK Uppers from Top Brands like Aero Precision, Radical Firearms & More, 164 products / 697models. That is what will happen!!! [email protected] US. It will still fire. The .300 BLK became a behemoth in the industry because of its direct compatibility with existing AR-15 rifles since it is compatible with almost every standard 5.56/223 AR-15 part. I chose the 10.3-inch Hanson barrel factory upper to be my trunk gun, where I valued reliability without needing a suppressor to add back pressure. . We also sell a huge array of other 300 Blackout accessories and gear that will increase your range, accuracy, and control, including : 300 Blackout rifle scopes, 300 Blackout muzzle devices, 300 Blackout reloading equipment, and 300 Blackout barrels. Type your email address and well send 16" 9mm Upper with 12" MLOK Slim Handguard (0) $310.99 On sale: $279.95 Sale Out of Stock. Shorter barrel lengths are excellent for close-quarters engagements making a .300 blackout rifle or pistol a great option for home defense, but youll want to protect your hearing with a suppressor or some other muzzle device. Customize your 300 BLACKOUT Complete Upper with an optic, muzzle device, rail, bolt carrier group, magazine, or charging handle from our matched selection. View as Grid List ; 8" .300 Blackout Pistol Length Modern W/7" AR15 Logic M-LOK Handguard Complete Upper . Get Our Top Shooting Drills and Zeroing Targets ($47 value - but FREE for a limited time). Calibre : .300 BLK - Canon (cm) : 20.3 - Catgorie : B - Coloris : Vert - Coups : 10 - Longueur (cm) : 37.44 - Poids (g) : 1120 . You do not pay Otherwise barrel length doesn't matter, when you start with a "pistol lower" kit. Msg frequency may vary. The .300 BLK has easily been the most successful new caliber in the last 20 years. We already have an account registered for email address a huge part of .300blk's appeal is the ability to spit out heavy ass bullets at a pretty low velocity, probably cycling issues with subs/suppressors. DB15 300 Blackout Ejection Port Cover Assembly $ 9.99. Another proven company for complete uppers. The Anderson Manufacturing 300 Blackout Complete Upper Receiver is a great way to quickly and conveniently build out, or change an existing AR-15 to shoot the popular 300 Blackout round. The QPQ nitride finish with an additional NP3 coating makes this barrel nearly impervious to surface wear, rust, and corrosion. Enter your email address for special offers from MAS Defense LLC, ATF Rule 2021R-05F - 80% Lowers 09-27-2022, ATF Rule 2021R-05F - 80% Pistol Frame Update 12-27-2022, ATF Rule 2021R-08 - Stabilizing Braces 12/28/2022, 6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE MIL SPEC BARREL NUT, 6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL, 6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL, 6" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE MIL SPEC BARREL NUT, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL - FDE, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL - FDE, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL - FDE, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL - FDE, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE MIL SPEC BARREL NUT, 7.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 12" LIGHTWEIGHT QUAD RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL - FDE, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL - FDE, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 12.62" M-LOK RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL - FDE, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL, 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL - FDE, 9.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE 12.62" MW8 OCTAGON M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE MIL SPEC BARREL NUT, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL - FDE, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 12.62" M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 12.62" M-LOK RAIL - FDE, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 12.62" M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE 12.62" MW8 OCTAGON M-LOK RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 9.87" LIGHTWEIGHT QUAD RAIL - FDE, 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 12" LIGHTWEIGHT QUAD RAIL. There is also a good selection of the lightest AR-15 handguard configurations available. The length also gave me enough rail real estate to put on lights. Rainier Arms specializes in high-end AR15 parts, AR15 accessories, AR15 grips, AR15 stocks, AR15 uppers, AR15 lowers, AR15 barrels and much more. A 10-inch barrel on an AR pistol or SBR rifle is perfect for the ballistics of 300 Blackout. Lightweight, compact, maneuverable, this integrally suppressed upper is able to serve in . MSRP: Your Price: $743.49. bolt carrier group (BCG), lower, and magazines as 5.56 NATO and 223 Remington, making it extremely easy to add a new caliber to your arsenal! Need a dedicated optic for the .300 BLK drops? Simple but effective. 300 Blackout Ammo is one of our most popular calibers. 21 models Grid Defense .300 Blackout Upper Receiver (1) As Low As (Save Up to 28%) $285.99 5% Bonus Bucks XTS AR-15 8.5in 300 BO Complete Upper w/ Ce Rail $334.99 (Save 15%) $285.99 Final Sale 3 models TRYBE Defense AR-15 Pistol 10.5in Upper M-LOK, .300 Blackout (7) As Low As (Save Up to 47%) $289.99 Blazin' Deal Jigs; Accessories & Optics; Handguns. It's everything 300 Blackout supersonic wishes it was. UPPERS, AR-15, 5.56. What I will do is point you to a few of the best .300 BLK upper receivers so that you can make your transition to this wonder-round. Aero makes gear that works, and these uppers are perfect for your next .300 BLK build or to convert your 5.56 rifle. And stay in touch with newsletters of our best articles on techniques, guns, & gear. The pistol upper has a 10.5" barrell with a 12.62" free float hand guard. DDM4 300s 10.3" 300 AAC BLACKOUT UPPER RECEIVER BLACK - Brownells It has a longer range than .300. Add to cart. The ammo price continues to drop, and upper receiver options are everywhere. Nav Menu 7. Select what level shooter you are! We have a great selection from the top brands at a price that is hard to beat. It is built around a 16 inch, 4150 chrome moly barrel that is chambered in 300 Blackout and has a black nitride finish. I have purchased a couple of .300 blackout upper receivers from MAS Defense.