Originally Posted By badazzar15:
There is a 50/50 chance you may have to.
This. Many people have notched hammers, and it runs fine. Mine did not––RRA 2-stage match trigger (non-NM). Got it replaced with the more rounded, more "modern" hammer that RRA is installing in the same system (but replaced free of charge...RRA warrenty came in handy!).
Try and see. It'll either work, or it won't.