It's have been a long time ago that i had this probleem, but i have to add...don't cut the half cock nub. After a period it gave me more problems with finetuning the leafspring even after installing this hammer in another setup. Full auto problems, auto fire while changing mags....bought a new hammer set, installed it, fine-tuning the leafspring after getting more experience and info from the web. No problems anymore and i feel confident about it
