Screws and bolts are eliminated on these economical 22lr magazines. By sonic welding the two halves together, no screws or brass are required, also resulting in a rigid magazine body. Clear smoke body allows for a quick assessment of round count. Nylon feedlips ensure positive feeding. Mfg: Black Dog Machine SPECS: Injection-molded polycarbonate, transluscent Smoke. Fits AR-15/M16 with a CMMG .22 LR Conversion Kit or other Atchisson- type conversion system. Also fits SIG 522.