ProMag DPMA4 Standard 40rd 308 Win Fits AR-10 Black DuPont

This replacement or spare magazine is compatible with your AR-308/308 Cal AR style rifles using LR-308 (DPMS) or SR-25 pattern mags. 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 item is not compatible with rifle using Armalite pattern magazines.