Hello all, I am new here. I have already recieved a welcome from an initial moderator. Thank you! I currently own a Taurus PT1911dt (Duo Tone model) I am very happy with tis weapon, It has been reliable, well functioning, and extremely accurate. I have owned it for approximately 6-7 months and in that time I have put upwards around 1000+ round through it with no problems. In that time I put a few modifications of my own to suit MY preferances, I put an 18.5 lb recoil spring in it, replacing the factory 16 lb, (to reduce wear on my barrel, etc...) a set of pachymar combat grips, ( I have big hands and the combat grips fit my hand better) and most recently a Wilson Combat Skelotonized hammer. ( the factory hammer sits up higher, and does not stick out to the rear as much as I liked- I keep one in the chamber, but I do not carry it cock-and -locked, its just theway I like to carry period, and the skelotonized hammer is easier to cock with the beaver tail hand safety) When I replaced the hammer, it is a little lighter wt than the factory hammer, the factory hammer has more metal, plus it has that little safety lock screw that taurus puts n their weapons, the Wilson Hammer does not have that stuff, so it was lighter. The factory hammer strut fit in place, no problem, and the sear lined up great (actually it gave the trigger pull a little crisper response) so I was happy with the part swap. Well when I replaced it, I took it to the range, and for the first time since I owned the weapon I had 2 out of 100-230 gr fmj winchester rounds not go off. The primers were struck, they were dented, but they didnt fire. Well My question is this: If you replace the hammer for a lighter one do you need to replace the firing pin spring for a lighter tension spring? or maybe a more rigid mainspring to give it more "OOMPH" when it shoves the hammer foreward? OR could it just be two dud rounds, and I am looking too deep into the gun parts? (hopefully!) Have any 1911 owners/ Gunsmiths out there ever seen this before?