Two-piece, synthetic base pad increases the cartridge capacity of pre-ban, GlockA(R) magazines without compromising reliability. Impact-resistant pad locks securely to the magazine body; removes quickly and easily with the supplied compression tool. Wolff, 10% extra power spring ensures reliable feeding. Checkered, bottom panel allows positive, non-slip, mag changes. USPSA Limited legal. Plus 3 meets the PPSC box rule. Adds +4 rounds to 9mm and +3 rounds to .40 S&W pre-ban mags. Mfg: Arredondo