ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturer's defects. Magazine springs are precision wound using heat-treated chrome silicon wire and each and every step of the assembly process is checked and double checked in order to maintain the same consistent level of quality.
FEATURES:
- 40-round magazine
 - Fits AR-308 / .308 Cal AR type rifles using LR-308 (DPMS) or SR-25 pattern magazines
 - Magazine body constructed of a proprietary DuPont™ Zytel® based polymer
 - Injection molded magazine follower
 - Magazine spring formed from heat treated chrome silicon wire
 - Does not fit rifles using Armalite pattern magazines
 - Made in USA