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Every firearm I own, I built myself.
This is done for rear sight clearance. Some rear sights, i.e. Bomar BMCS, Some Novak Lo-mount, some LPA, Eliason, etc, intrude into the firing pin stop and need extra clearance, so the top of the firing pin stop is cut off.Fixed it! Woohoo! Why the hell did they make this one square and not rounded. Dan Wesson Bruin.