However, the only way to do that reliably without having to use an adjustable gas block is by using an adjustable bolt carrier group. Any 300BLK build is intended to easily shoot supersonic and subsonic loads, either suppressed or unsuppressed. Its minimal hammer mass reduces pre-ignition vibration, aiding in enhanced accuracy.ĭue to the many ammunition options on the market for 300BLK ammo, I chose to use Bootleg Builder Inc.’s adjustable bolt carrier group. The Geissele Super Semi Auto Enhanced Trigger has a 2.3-pound first stage and a 1.2-pound second stage. I however, had to go back to a trigger I’m used to. Triggers are very subjective and there is a wide gamut that would absolutely be suitable. All you have to do to complete the receivers are adding a trigger, dust cover, and safety selector. Also, an advantage of any of the Ascend Armory receiver sets is that most of the parts come pre-installed. I chose the Ascend Armory Lightweight Matched Billed Receiver Set based not only on performance but aesthetics as well. A 7075 billet matched receiver set is a must. While nearly any AR-15 receiver set will suffice to build a 1- to 2-MOA 300BLK gun, truly taking advantage of sub-MOA potential requires tighter-than-standard-tolerance components. Follow along as I run through the different components used in this build I wanted to try my hand at building a hard-hitting, 300 BLK chambered, maneuverable, 10.5-inch-barreled gun that is capable of sub-MOA hits. It was upon hearing these results that set me on the path of building the gun that you see here. The ammo is specifically tuned for Rainier Arms 10.5-inch Ultramatch MOD2 Barrel with a 1:7.5 twist. It achieved half-inch groups at 100 yards, which is impressive for a Blackout round. The manager at Rainier Munitions recently showed me the latest results from their newest 300BLK 125GR SST load. 308 ammunition for their shooting teams, and have only recently begun making this ammo available to the public. They have actually spent years developing and perfecting 9mm. No, they don’t outsource their ammo and rebrand it to their own. Rainier Arms, a retailer that is renowned for selling top-tier firearms products for the discerning gun owner, has recently developed its own line of ammo under the brand name Rainier Munitions. Now that manufacturers have realized it’s here to stay, they have seriously stepped up their game to make consistent quality ammo. 223 or 5.56 brass in an attempt to fill orders for a caliber with an uncertain future. Early in the caliber’s life, the lack of ammo availability and its newness led to inconsistent varied loads from converted brass, ammo manufacturers cutting reloads from cheap, used. One of the most common misconceptions of the 300 Blackout-it’s never been known to be the king of accuracy. They oftentimes also have reduced-capacity magazines, require different bolts, and occasionally a replacement upper receiver. AR-15s that use other boutique calibers, in comparison, do not only require the replacement of the barrel. The larger caliber swap doesn’t even compromise ammunition capacity, either. Part of Blackout’s success can be attributed to the fact that the only conversion needed to build a 300 Blackout AR-15 is a barrel swap.
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