Lengthening the forcing cone in a shotgun barrel will improve patterns and reduce felt recoil. Constructed of high speed steel with 8 left hand spiral flutes, these 12" reamers will cut 12 gauge forcing cones up to 3.1" long and 16, 20 and 410 bore up to 2.9" long. Features a 1/2" shank with 7/16" flats.
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