Manufactured in the US with the highest quality components, the BRN-15 Upper Receiver Groups are great starts for your next build.
The BRN-15 Upper Receiver Groups feature a 5.56x45mm NATO chambered, nitride finished barrel, available in several popular lengths. Models are available in a Government, medium profile barrel, with the 16 inch also available in a lightweight contour. Barrels feature a gas block dimple, that the rear gas block screw securely engages. All barrels are stress releived.
Unique MLOK handguard extends past the gas block, to provide as much usable real estate as possible. Anti-rotation tabs at the rear of the handguard engage the upper receiver, preventing any cant in relation to the receiver picatinny rail. Large dual screws clamp and pass through the properly torqued barrel nut to ensure the handguard will not slip forward. Large vents are placed towards the rear, to allow both the barrel and handguard to cool more rapidly.
The Brownells Bolt Carrier Group is made by a well-established firearms industry manufacturer, made to our specifications. All components of the BCG are made in-house, under one roof, not outsourced to the lowest bidder. Even the firing pin and gas key, commonly outsourced components, are machined by our manufacturer. These Bolt Carrier Groups are rigorously inspected at the factory, for hardness requirements, fitment, cam path geometry, magnetic particle inspection of the bolt and more. Materials for these Bolt Carrier Groups are certified in batches and the dimensions are true to the most current military specifications. Proudly Made in the USA.
Forged Mil-Spec type upper receiver features M4 feed ramps, ejection port cover and forward assist. Forward assist pin is knurled at the front, to ease future swaps.
· 4150 CMV (Chrome Moly Vanadium) Barrel
· Chambered in 5.56x45mm NATO
· 1-7 Barrel Twist
· 1/2-28 Muzzle Threads
· A2 Flash Hider
· Forged 7075-T6 Upper Receivers
· Hardcoat Anodized Upper Receiver
· M4 Feedramps in Upper & Barrel Extension
· Barrels are marked "5.56 NATO 1:7 4150CMV SR"
· Bolt is made from 9310 hardened steel, shot peened and magnetic particle inspected
· Carrier is machined from 8620 hardened steel
· Extractor is machined from 4340 steel and includes mil-spec extractor spring and black o-ring
· Gas Key is machined from 4130 steel and attached with Grade 8 screws, that are properly staked into a milled “valley” to ensure proper positioning
· Cam Pin is machined from hardened 4340 steel
· Firing Pin is made from 8740 steel, center-less ground and hard chrome coated
· Magnetic-particle inspected Bolt
· Extractor includes spring and rubber insert
· Includes torqued and staked gas key
· Functions with any cartridge based on the 5.56 NATO cartridge case
· 100% American Made
Please note, the 16 inch lightweight features a lock nut on the muzzle device. To remove, secure the lock nut with a wrench, turn towards the rear, and unscrew the flash hider.
All NFA Rules Apply.
