*30 Caliber Muzzle Brake, 5/8 x 24 thread. 8620 Steel Parkerized finish. The HammerHead is popular with 3 Gun Match shooters because it reduces muzzle movement to near Zero.
*AKS Mac/90 Armorers Course, DVD video by AGI
*Winchester 86, 92 Armorers Course, DVD video by AGI
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