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. In other words, ...

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 ...

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.

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 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 ...