ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturers 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 :Hybrid Design Magazine Body Constructed of Heat Treated Carbon Steel Upper Feed TowerInjection Molded Polymer Drum HousingInjection Molded Magazine FollowerMagazine Spring Formed From Heat Treated Chrome Silicon Wire15 Round Drum Magazine