This Extended Magazine Release Button will fit Delta Gen.1 & All Delta Gen.2 models. The button is extended to make releasing the magazine a lot easier but still fit to all BGs and most aftermarket holsters available. This set includes: 1x Delta Extended Mag. Release Button (choose the side of extension) 2x Delta magazine catch spring (1x OEM, 1xLight) Please visit the following link for installation instructions: MAG. RELEASE INSTRUCTIONS | AREX defense store (arex-store.si) This kit is not 100% drop-in and should be installed or checked over by a competent gunsmith prior to shooting.