Brownells BRN-180 Upper Receiver 22LR with Adjustable Stock

The Brownells BRN-180 Upper Receiver in 22LR delivers reliable rimfire performance with adjustable stock compatibility for versatile training and recreational shooting. This complete upper assembly transforms any compatible lower into a cost-effective training platform while maintaining familiar AR-15 ergonomics.

What Makes This Different

Unlike standard blowback 22LR conversions, the BRN-180 system utilizes a short-stroke piston operating system that runs cleaner and requires less maintenance. The adjustable stock interface allows shooters to customize length of pull from 11.5 to 14.5 inches, accommodating different body types and shooting positions. This upper receiver assembly includes integrated Picatinny rails and accepts standard AR-15 magazines through the included adapter.

Key Features

• Short-stroke piston operating system for reduced fouling and consistent cycling
• Adjustable stock system with 3-inch length of pull adjustment range
• Integrated M-LOK handguard with full-length top Picatinny rail
• Compatible with standard AR-15 lower receivers and fire control groups
• Includes magazine adapter for reliable 22LR feeding
• Folding iron sights with windage and elevation adjustments
• Matte black hard-coat anodized aluminum construction

This upper receiver excels in training environments where high round counts and consistent performance matter most. The 22LR chambering reduces ammunition costs by up to 75% compared to centerfire cartridges while maintaining realistic recoil impulse for skill development. Weather-resistant finishes and corrosion-resistant materials ensure reliable function in adverse conditions, making it suitable for both indoor ranges and outdoor training facilities.

Technical Specs

• Caliber: 22 Long Rifle
• Barrel Length: 16 inches with 1:16 twist rate
• Overall Length: 32-35 inches (stock dependent)
• Weight: 4.2 pounds complete upper assembly
• Material: 7075-T6 aluminum receiver, 4140 steel barrel
• Finish: Type III hard-coat anodized black
• Compatibility: Mil-spec AR-15 lower receivers
• Rail System: M-LOK slots at 3, 6, and 9 o'clock positions
• Manufactured: United States

This upper receiver assembly provides shooters with a proven training platform that maintains muscle memory while reducing operating costs. The adjustable stock system and reliable piston operation make it an intelligent choice for serious training programs and recreational shooting alike.