Stripped, small pin, semi-auto lower receiver is precision machined from a durable, 7075 T6 aluminum forging. Stamped “Cal Multi,” this versatile mil-spec receiver can be the foundation for rifle builds on 5.56/.223, 6.5mm, 6.8mm, 300 AAC Blackout, 9mm Luger, or other chamberings that fit the standard AR-15 receiver. Holes, inletting and pin locations have been cut to final dimensions and accept standard AR-15 magazines and components. Clearly stamped safe/fire switch position indicators ensure that you can easily identify the service state of the rifle.
SPECS: 7075 T6 aluminum, hardcoat anodized. Small pin, .154” (3.9mm) hammer/pin holes. .250” (6.3mm) pivot/takedown pin holes. FFL required for purchase.
Looking to build your next AR-15 rifle? The Colt AR-15 M4 Complete Lower Receiver provides AR builders with the perfect foundation upon which to construct the rifle of their dreams.
The Colt AR-15 M4 Complete Lower Receiver is made entirely from 7075-T6 aluminum and features a black hardcoat-anodized finish for added durability.
The Colt AR-15 M4 Complete Lower Receiver is built using the same parts and the same attention to detail as the company's popular line of LE6920 AR-15 rifles.
Sometimes you want the latest, updated, tweaked component, and sometimes you need a basic stripped receiver where the production effort goes into quality, rather than bells and whistles. The Brownells M4 Stripped Upper Receiver is that component - the perfect starting point for many an AR-15 build.
Starting with a 7075 T6 aluminum forging, our stripped M4 flattop upper is precision machined to final dimensions that make it compatible with the multitude of available "mil-spec" AR-15 components. It has a matte black, Type III hardcoat anodized finish, mirroring the military requirement.
Inside our upper features M4 feed ramps to aid in chambering during high rates of fire. And outside the T-marks in the Picatinny rail’s slots are painted to aid in fast exchanges of optics.
Please note: this is a truly stripped upper receiver, with NO forward assist or ejection port cover installed, so you can truly customize every aspect of your rifle. The Brownells M4 Stripped Upper Receiver is a top-tier upper receiver, at a great price.