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Joseph, This extension kkit adds 3 rounds to 9mm, .40 S&W, and .357 SIG calibers. It adds 2 rounds to .45 GAP caliber. This kit includes magazine spring, collar, base plate and disassembly tool. This kit is designed for GLOCK Models: 26, 27, 33, and 39.

Joseph - The Ghost Inc For GLOCK Magazine Device Extension Kit is designed to give you additional rounds in your magazine. This extension adds 3 rounds to 9mm, .40 S&W, and .357 SIG calibers. This kit includes magazine spring, collar, base plate and disassembly tool. This kit is designed for GLOCK Models: 26, 27, 33, and 39.

3 rounds added