Gen 1-5 glock trigger shoe too narrow for gen 1 n-4. - Overwatch Precision Polymer Glock DAT Trigger Kit

This is a good glock trigger for the price. The area around the trigger hole has been modifed from that of the original gen3 and gen4 full size frames to accommodate the narrower gen 5 frame. The trigger pin for the non gen 5 glock will not be locked in place by the slide release lever and will start walking out to the right during firing. The trick is to insert a #8 or #10 brass washer between the trigger shoe and the slide release lever to fill in the space between them. The slide release lever will now engage the groove in the trigger pin to lock it in place.