The Black Dog Machine AR15 .22 Sonic Weld Magazines are designed to feed many well know .22LR conversions kits, rifles, and dedicated upper receivers. The sonic welded bodies eliminate the brass and screws and makes for easier disassembly and reassembly. These magazines have a black polycarbonate body and steel feed lips. These magazines are not compatible with: S&W M&P 15 .22, H&K 416.22/Umarex, HK-416D Pistol, Colt/Umarex M-4 Carbine, M-4 OPS, M-16 Rifle, Beretta ARX160 .22LR, M-16 SPR, and other models that may not be listed. Mfg: Black Dog Machine