I find I get last stacking with a 14lb hammer spring, but overall the trigger is heavier in DA. I prefer the 13lb, but lately had some issues with Winchester primered ammo from DA only...Ie: first shot. I try to use all federal primed ammo. I am currently using the Xtreme firing pin, but in order to stay production legal, I have to use the firing pin block. The firing pin block is what causes all the problems with light strikes. it sometimes gets stuck if the firing pin is dirty or the block is dirty.