ULTIMATE TRIGGER STOP 40/357 GEN 1, 2, 3 ONLY. .40S&W and .357SIG version Ultimate Trigger Stop (LWD-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 LWD-UTS includes a new style trigger housing with ejector, polished trigger stops 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. LWD-1896 fits all 1st, 2nd & 3rd generation 40 S&W pistols G22, G23 G24, G27, G35. LWD-1896 fits all 1st, 2nd & 3rd generation 357 Sig pistols G31, G32, G33. The LWD-1896 will NOT fit any current production 4th or 5th generation pistols.