New self-contained BRN-180 uppers provide a great opportunity to build a folding rifle.

Pistols and SBRs continue to grow in popularity. More shooters seemingly want highly-concealable, highly-portable long guns or AR pistols chambered in formidable calibers. Now with the Brownells BRN-180 upper, shooters can build their own rifle in 300 BLK, complete with a folding stock, suppressor and more.

Brownells BRN-180 Uppers

The Brownells BRN-180 uppers combine features form the classic AR-180 design. But it now includes modern upgrades, including a full-length Picatinny rail and free-float M-LOK handguards.

All BRN-180 Gen2 uppers accommodate folding stocks or braces. The design completely contains the recoil mechanism, so no buffer tube assembly required.

The BRN-180 Gen2 also utilizes a new method to secure the handguard and adjustable gas block. The design helps the platform work well with suppressors, according to Brownells.

The newest model utilizes a 10-inch barrel chambered in 300 AAC Blackout. Other Gen2 BRN-180 uppers chamber 223 Wylde. For more information, visit

BRN-180 Features

  • Adjustable Gas System now on ALL models
  • Simplified, more secure Gen2 handguard attachment system (see below)
  • Ultra-reliable Short Stroke type piston operating system
  • Ideal for folding stock/brace (see below)
  • Compatible with ANY current mil-spec AR-15 lower
  • Machined 7075 T6 aluminum receiver & handguard with hardcoat anodized finish
  • Barrels of extra-strong 4150 carbon steel with a tough, matte black Nitride finish
  • Button rifled bore with 1-8″ twist
  • Replica three-prong AR-180-style flash suppressor
  • 1/2″-28 tpi threaded muzzle (5/8″-24 tpi .300 Blk)
  • Molded polymer ejection port cover

Brownells BRN-180 Variants

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