Black Friday Exclusive: FREE BRN-180M Lower Receiver
For Black Friday, get a FREE Brownells BRN-180M Stripped Lower Receiver with the purchase of a BRN-180 SCNR 9" .300 Blackout Complete Upper Receiver. This limited-time combo pairs our compact, suppressor-focused .300 BLK upper with the purpose-built BRN-180M lower, giving you two key components for a bufferless BRN-180 build while saving on the lower receiver.
BRN-180 SCNR 9" .300 Blackout Complete Upper
The BRN-180 SCNR 9" .300 Blackout upper is designed to take advantage of the cartridge's excellent short-barrel performance. Its compact 9" barrel features a fast 1:6" twist rate selected to stabilize the long, heavy projectiles commonly used in subsonic .300 Blackout ammunition, while retaining compatibility with supersonic loads.
Built around an AR-180-based short-stroke gas-piston system, the upper features a self-contained recoil assembly that eliminates the need for a traditional buffer tube. Its 3-position adjustable gas system provides Suppressed, Normal and Adverse settings, with tuning optimized specifically for the 9" .300 Blackout configuration and suppressed operation.
FREE BRN-180M Ambidextrous Stripped Lower
Designed specifically for BRN-180 uppers, the BRN-180M lower is precision-machined from 7075-T6 billet aluminum and finished in black hardcoat anodizing. Its integrated M1913 Picatinny rear interface accommodates compatible folding stocks without requiring a traditional buffer tube or separate rail adapter.
The receiver also features ambidextrous bolt and magazine releases, an oversized integral trigger guard and compatibility with standard mil-spec AR-15 lower components.
Combo Highlights
- Black Friday Offer: FREE BRN-180M stripped lower with purchase of the 9" .300 Blackout SCNR upper
- Upper: BRN-180 SCNR 9" .300 Blackout with 1:6" twist barrel
- Gas System: 3-position adjustable gas system tuned for the 9" .300 BLK configuration
- Lower: BRN-180M ambidextrous 7075-T6 billet receiver
- Stock Interface: Integrated M1913 Picatinny rail for compatible folding stocks
- Platform: Bufferless BRN-180 design with self-contained upper recoil system
Non-Reciprocating Left-Side Charging Handle
The left-side charging handle stays stationary during firing, keeping it clear of the shooter and support hand as the action cycles. Its location also allows the support hand to operate the action while the firing hand remains in position.
Downward-Angled Charging Handle
The streamlined charging handle angles downward for easier access and improved clearance around mounted optics. The shape also provides a more natural grasp when charging the upper or manually locking the bolt to the rear.
Sealed Charging-Handle Channel
A protective rubber gasket seals the charging-handle channel while allowing the handle to move freely. The sealed opening helps keep dirt, dust and debris from entering the receiver and reaching internal components.
Automatic Ejection-Port Cover
The traditional hinged dust cover is replaced by a carrier-mounted ejection-port cover. It opens automatically as the bolt carrier cycles and closes when the action returns to battery. An AR-15-style shell deflector sits behind the ejection port to help manage ejected cases, while the automatic cover helps protect the receiver from external contaminants.
9" .300 Blackout Tuned 3-Position Gas System
Select Suppressed, Normal or Adverse gas settings through the handguard without tools. The system is tuned specifically for the 9" .300 Blackout configuration and optimized for suppressed operation with both traditional baffle-style and flow-through suppressors. The gas block and valve use a Chromium Tungsten Nitride finish to help reduce carbon fouling, while the handguard helps deflect vented gas away from a forward support hand.
Retained Recoil & Bolt-Carrier Assembly
A retention system keeps the guide rods, recoil springs and bolt-carrier assembly securely contained when the upper is opened or removed from the lower receiver. Press the release when it is time to remove the assembly for controlled field stripping, cleaning and maintenance.
Additional Reliability, Durability & Mounting Upgrades
The BRN-180 SCNR uses upgraded flat-wire guide-rod springs to help drive the bolt carrier fully into battery as fouling builds. An anti-bounce bolt-carrier design helps prevent the carrier from rebounding after it closes, supporting reliable ignition and cycling. A full-length steel cam path reduces wear between the steel carrier and aluminum receiver during extended use, including suppressed shooting.
A strengthened handguard attachment interface provides a rigid, low-flex mounting platform for optics, lights, lasers, grips and other accessories. Ambidextrous QD sling sockets use hardened steel inserts for added durability and flexible sling placement. At the muzzle, an added barrel flange provides cleaner muzzle-device fitment without the special adapters required on earlier BRN-180 generations.
Note: The lower receiver is stripped. A lower parts kit, trigger assembly and stock are not included. The lower receiver is subject to applicable firearm transfer requirements. This 9" upper configuration may be subject to NFA restrictions depending on the completed firearm's configuration. All applicable federal, state and local firearm regulations apply.
