Well I just fired 30 rounds from her with the 4.5 pound hammer spring in. I fired 5 rounds tula fmj, 5 rounds red army standard fmj, 5 rounds brown bear fmj, 5 rounds monarch fmj. 5 rounds golden tiger and five rounds tula hollow points. All rounds fired except for one golden tiger and it fired on the 2nd trigger pull. So I'm going to go with the heavier weight spring and I think that'll cure it. No issues with c products gen 3 20 rounder and no short stroking. I guess wednesday when I'm off again I'll change out the hammer spring for the heavier weight one.