ProMag COLA30 OEM 22 LR Colt M4 30rd Black Detachable
This replacement or spare magazine is compatible with your Colt M4. It is constructed of DuPont Zytel polymer with injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA. NOTE: This mag will not work with Ciener and G.I style 22 conversion rifles.