The Geissele Automatics hammer for a Benelli M4 Super 90 is a direct replacement for the original hammer. There is no fitting required and does not require gunsmith installation. The hammer is manufactured from S7 tool steel to provide years of reliable service and hard use. The mil spec black oxide finish is corrosion resistant. This part is manufactured in the U.S. and provides an additional 922(r) compliant part.
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