BASTION Laser Engraved Mag Butt Plate, Magazine Floor Base Plate Glock All Gen 1-5 9mm .357 .40 .45 Gap - Zero FXXXS Given Compatible with Glock Models 9mm 40cal, .357, 45 GAP ONLY GEN 1-5 Replaces factory part with durable aluminum custom base plate Made from black-anodized, hard-coat 6061 T6 aircraft billet aluminum Laser engraving will not rub off; not painted, not a sticker Permanent laser engraving