The Ghost 3.5 LB. connector is a drop-in connector (no fitting required). It is designed to give a lighter and smoother trigger pull than factory. This is accomplished by precise manufacturing processes and pre-polishing of the key contact points. These methods ensure the GHOST 3.5 LB. TRIGGER is optimized to improve the trigger pull of all generations of GLOCK semi-automatic pistols. With a superior GHOST INC trigger connector you will shoot better and faster.DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.