Ultimate Trigger Stop Glock G21SF/30SF Ultimate Trigger Stop (UTS) gives you a competitive edge by completely eliminating Glock trigger over travel. Trigger over travel is defined by: "The amount of rearward movement after the firing pin has been released". The results of eliminating trigger over travel (wasted movement) are; smoother trigger reset, faster doubles, faster splits and overall premium trigger performance. The UTS includes a new style trigger housing with ejector, polished trigger stop and Allen Wrench for adjustments. This drop in part replaces your current trigger housing. The easy to follow instructions allow you to completely remove your trigger "over travel" in seconds. No gunsmithing is required. The UTS allows you to "turn it on or turn it off" at will. Available for all Glock pistols but highly recommended for plinking, target or competition use only. LWD-5406 fits G20/21SF and G29/30SF only. NOTE: WILL NOT fit standard G20/21 or G29/30 pistols. Shipping Weight: 0.012 lbs