The Lone Wolf 3.5 lb Connector is an improved version of the Glock original 3.5Please understand to get a true 2.5-3.5lb trigger pull you must must a competition spring kit.Special features include:    * 25% reduction in side thickness provides superior reset action.    *Brand New 3.5# Connector Rocks the IndustryLone Wolf Distributors is proud to announce our new 3.5# connector with a slippery new coating.Precision target shooters and Law Enforcement personnel demand excellence in trigger performance. Now you can tune your trigger to perform its best! This drop in part is easily installed or removed and will instantly provide a lighter crisper trigger pull.