Easy to load and seat with the slide in battery; Positive slide lock when empty; .025" Wall Thickness; Superb feeding with a wide range of ammunition types; Steel follower for flawless slide lock-even with marginal pistols; Stainless Steel ETM has the strongest magazine tube yet developed, virtually eliminating feed lip cracking, tube spread and cracking and general fatigue; Proprietary multi-step tumbling and finishing process provides smooth follower operation and insertion into the weapon; Observation slots moved to the rear of the tube, located exactly where they need to be to maintain the structural integrity; Removable Base Pad for easy maintenance and versatility with different base pad options; Black Fluoropolymer Finish