I need a drop in replacement trigger job for my 1911 Sig Tac Pac. I don't wish to modify the existing trigger parts so if the gun ever requires work I can simply drop in the original parts and its warrantee is still good. So, are the 1911 Sig parts the same as a standard Colt or Colt clones that are out there? I require a nice crisp 3.5 trigger pull with no creep. I have looked thru Brownells catalog and they don't list the Sig 1911 among their Sig list. The gun is absolutely deadly accurate and its only flaw is its 10lb trigger pull.