The Speedmag is a fully-functioning magazine plus a built-in speed loading system. Proprietary mag follower/loading ring allows you to load multiple rounds at once for speed and convenience wherever you practice your shooting. Dependable range-ready smooth feeding and firing, too. Reduce fatigue by loading multiple rounds at once Ultra-durablea |passes fully-loaded drop tests on concrete 30-round capacity Fits standard mil-spec lower receivers (5.56 NATO/.223 Rem/.300 BLK) Tough composite body Quick-release base plate Proprietary follower/loading ring Stainless steel spring Dependable feeding and firing for the range Not intended for duty, combat, or self-defense applications Lifetime Manufacturer Warranty