When you first receive this connector, install it first before trimming/reducing. Apply extra pressure and see if it releases the firing pin. If it does with extra pressure you will trim down very little to get a clean smooth release. This is the connector long sought after by Glock 42, 43, 43X and 48 Enthusiast everywhere. This is the Smoothest Connector on the market today. The G42/G43 PRO fixes the Glock bump or glitch, this is the pre-travel r