Machined aluminum basepad extends the magazine to make it much easier to load and manipulate. It weighs a full ounce (compared to a few grams for the stock basepad) which helps the magazine fall clear of the pistol when empty. It compares favorably to our "bling brass" basepad in performance, but adds a little extra length for positive seating. Solid aluminum construction adds just enough weight to make your Glock magazines easy to handle (and seat positively) at warp speed. Many similar products are too heavy for IDPA and SPP, or will make your gun too heavy in USPSA if you use any other heavier-than-stock part. Self-defense users like how the extra thickness makes the magazine "seat" positively -- yet the magazine remains totally secure and unchanged from a reliability point of view.