HaveBlue tried to use the same lower receiver to make a full-blown .223 AR-15/M16 rifle (Opens in a new window), but it didn't work. Funnily enough, he thinks the off-the-shelf parts are causing ...

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 ...

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.

It is in this arena that the M16 has excelled ... The VLTOR extension attaches to the lower receiver like a standard M4 extension with a receiver end plate and castle nut.

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. The primary difference between ...

Following the EPR's release, engineering tests of M4/M16 rifles firing the M855A1 showed ... the EPM into the magazine well of a carbine's lower receiver that positions rounds for feeding.

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. The primary difference between ...

The upper and lower receivers were combined into a single receiver ... and it is about 30 percent heavier than the M16. The M16, like the AK-47, is also a gas-operated rifle and features a ...

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.