The innovative SHRIKE 5.56 upper receiver is designed to fit any MIL-SPEC quality AR-15/M16/M4-type lower receiver and features a dual-feed system, allowing users to configure the SHRIKE 5.56 from ...

An MR556A1 Upper Receiver Kit includes ... and buffer spring and attaching the HK upper to an AR lower receiver using the ... place of the gas tube normally found in AR15/M16/M4-style ...

Early SP1s closely mimicked the Colt 601 version of the M16, with a three-prong “duckbill” flash hider, solid stock, fenceless “slabside” lower receiver and upper receiver sans forward assist.

The upper includes the barrel, handguard, upper receiver, charging handle and bolt carrier group (BCG). The bottom half, or “lower,” contains all of the components needed to fire an AR-15.

However, the T65 is hardly a clean-slate design, practically copying the M16 design in the lower receiver and heavily emulating other elements in the upper receiver.

HaveBlue's custom creation (Opens in a new window) is a .22-caliber pistol, formed from a 3D-printed AR-15 (M16) lower receiver, and a normal, commercial upper.

However, the T65 is hardly a clean-slate design, practically copying the M16 design in the lower receiver and heavily emulating other elements in the upper receiver.

Army engineers and scientists optimized the EPM to work with the M4/M4A1, M16 rifle, and standard military 5.56mm small arms round, the M855A1. The M855A1, known also as the Enhanced Performance ...

U.S. Special Operations Command is acquiring a new suppressed upper receiver group to augment the M4A1 rifle commonly used by its special operators. (Photo: US Army) U.S. Special Operations ...

The M16 rifle has two main components—an upper and lower receiver. According to Summers, for a Soviet-caliber M16 to use NATO ammunition, only the upper receiver needs to be modified by ...