If you are going to use the light (yellow) springs with the trigger kit, you need to either use the speed hammer or lighten your hammer, or you will have an occasional miss-fire. Lightening a G.I. hammer is easy, just cut off the back of the hammer that looks like a bird's beak. They work great that way or you can get the speed hammer which is designed for the trigger. Either way you will have a great trigger! KurtM
Lightening a G.I. hammer is easy, just cut off the back of the hammer that looks like a bird's beak.