Could have been the overtravel, it was factory installed on a dpms 3g1 rifle, but I did watch the whole installation video while checking function, and it seemed to be set-up about as good as possible according to the vid. Figured I'd try the S3G, if I didn't like it, return it and get something else, maybe a JP. S3G didn't require any fitting or tuning, or any screws, simply install and run. The geissele is really silky, roller bearing like, a different kinda smooth, wish I'd had both next to eachother to compare.