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I just installed the Geissele US-made hammer (acquired through Carriercomp) on my m4, and it functions flawlessly so far. Upon close inspection, the Geissele unit I received differs slightly from the Benelli OEM in several respects. One such difference is that the surface finish on the Geissele does not coat the entire hammer: there is a small patch directly behind the rear sear (the one that engages the disconnector) which seems to be bare tool steel. It may be that the corresponding region by the front sear (trigger engagement) is similarly un-coated, though I did not note this. Did anyone else observe this on their Geissele hammer? Is this a design feature, or is the surface coating on my hammer defective? Does anyone know how the Geissele is coated (Benelli coats theirs with a phosphate, I think)?