The Ghost Tactical Extended Magazine Release fits gen 1-3 Glocks and is extended for ease in changing magazines, and has beveled edges to eliminate snagging. The small model works in Gen 1-3 9mm, .40 S&W, .357 SIG and 45 GAP models. The large fits Gen 1-3 10mm and 45 ACP models. Mfg: Ghost SPECS: The small model works in Gen 1-3 9mm, .40 S&W, .357 SIG and 45 GAP models. The large fits Gen 1-3 10mm and 45 ACP models.