SPECS: Impact-resistant plastic, black. One per pack. Beretta fits Beretta 92 and Browning High Power. KAHR, 2 per pack, fits Mk-9, K-9, K-40. Ruger® LCP™, 2 per pack. Extension does not increase weight. Plus One and Plus Two extensions increase magazine capacity by one or two rounds. Glock Plus Two* adds two rounds to 9mm magazines, one round to .40 S&W and .357 SIG magazines. Legal for pre-ban magazines only. Glock Sub-Compact Plus Extension XL** adds one round for Model 39, two rounds for Model 27/33, and three rounds for Model 26. Glock Plus XL Magazine Extension*** adds one round in .45 GAP magazines, two rounds in .40 S&W and .357 SIG magazines, and 3 rounds for 9mm magazines. Springfield XD fits 9mm, .40 S&W, .357 Sig, and .45 GAP only. Springfield XD .45 ACP fits .45 ACP caliber only.