7.5" 300 BLACKOUT Stainless AR15 Pistol Upper Assembly with 9" Rail and Slim Cone Flash Can
The 300 AAC Blackout was designed to achieve energies like the 7.62x39 Soviet in an AR16 while using standard AR15 magazines at their full capacity. The 7.62 Soviet's cartridge taper prevented reliable feeding in AR magazines and created wear on the bolt. From the 14.5in barrel of the AR15, the 556 round has an effective point target range of 500 yards. The bullet has significant drop, drift, and energy loss at that distance. From a 16in barrel, a 125gr 300 BLK round has a lower velocity and similar bullet drop and drift at shorter distances. However, it has the same amount of energy at 700 yards that the 556 has at 500 yards. In terms of hit probability, the Blackout has an effective range of 450 yards. From a 9in barrel, the 125 gr BLK round has the same muzzle energy as the 556 from a AR15, and 5 percent more energy at 440 yards. In comparison with 7.62×39mm rounds, 300 BLK rounds with varying loads have a better ballistics and more energy out of similar length barrels.
- 7.5" 300 BLACKOUT 416R Stainless Heavy Contour Barrel with 1x8 Twist and 5/8x24 Threads.
- Mil-Spec Upper Receiver forged from 7075 T6 aluminum with forward assist and dust cover assembly installed. Hard coat anodized MIL-STD 8625 Type 3 Class 2.
- 9" Narrow Profile Free Float Rail machined from 6061 T6 aluminum. Very comfortable and very light weight. Your choice of M-LOK or KEYMOD attachment points along the entire length at 3, 6, and 9 positions. Hard coat anodized MIL-STD 8625 Type 3 Class 2.
- 0.750" Low Profile Gas Block.
- Pistol Length Gas System.
- Slim Cone Flash Can with crush washer.
- AR15parts will customize (to your specificaions in the drop down menu) your AR15 upper with the Rail Type (M-LOK or KEYMOD), a Magazine or two, one of our High Quality Bolt Carrier Groups, and your choice of 5 different Charging Handles.
This upper assembly will fit all standard AR15 lower receivers.
This item is "Firearm Parts", not a complete firearm (no serialized components). It will be shipped directly to you with no FFL transfer required.
You are responsible for knowing federal, state and local laws applicable to this item. AR15Parts.com reserves the right to not ship to addresses where it may not be legal to own this item.
ReviewsGTook my blackout to the range and worked great, barrel didn’t start to feel warm until the 5th magazine, processing and the shipping was quick work, thank you guysPhilip Mancuso
300 BLK Pistol UpperFit and finish is excellent.Only issue I have is that I cannot use a suppressor due to barrel and hand guard length. My fault for not paying more attention to detail.I have since purchased the same upper with a 8.5” barrel and same length handguard and it works perfect for suppressor mounting.Marc
Why pay more for a 300 BLK UpperThis is my 4th AR build and my 1st time buying from AR15part.com. All I can say is that I wish all came from here. The first surprise was the upper arrived assembled. Uppers from the other guys all came unassemble unless you paid an up charge. The fit and finish is excellent and the barrel is substantial. After breaking in the barrel, I ran 200 rounds of hand loaded subsonic ammo without a hitch. I was testing loads and once I got into the 900s the upper functioned flawlessly with a KAK Pistol brace/buffer tube kit. Last but not least, ordered the upper during the height of the Pandemic and it took all of a week from order to delivery.giovanni ferraro
AMAZINGLooks good gave it four stars because I haven’t tested it yetDarrel Schenck
AR 300 blkout upperAs advertised and quick delivery. Very satisfied.AZ fan
Awesome upperI ran 150 rounds through it with no issues... I will buy from them againDerek bailey
Ecellent customer serviceAfter placing my order and seeing i ordered the wrong thing, totally my fault for the mess up. Its not like they placed the order for me. It was all my fault and I admit it. My order was promptly and correctly shipped out within 24 hours. Best experience from any place I've dealt with and I do alot of business with many places.Mike
Great productOrdered last Friday and received Thursday. Went to the range today and ran a few hundred rounds through it. Everything cycled perfectly. Couldn't be happier. Every other site was either completely out of stock or wait times keep changing and only been getting excuses. Will definitely be shopping here again!Garrett Jones
300 blackout 7.5” barrel upper receiverThis upper definitely exceeded my expectations. I got the upper fully completed minus a bolt carrier group. I have put two different bolt carrier group into the upper that worked flawlessly. I have also mounted the upper to multiple different lower receiver with no issues at all. Overall the upper seems to be very well built and seems like it will stand the test of time. Very impressed with this product and can’t wait to get another build going.Mark Pavelka
PartsExcellent service parts were perfect arrived quickly with great packaging I'm a return customer for sure
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DetailsCurrent Stock: 81SKU: UA30B75SS08HC24P_09ML00_SCUPC:Availability: Usually Ships in 24 HoursOld SKU: 75300SSU1x7MLRL