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HMB Bolt by HM Defense is made in the U.S.A. and the HMB is 100% compatible with Mil-Spec M16 & ..
Specifications: Length: 4" .40 S&W Caliber 1:16 Twist 5/8x24" Thread Pitch 4150..
Specifications: Length: 8" .40 S&W Caliber 1:16 Twist 5/8x24" Thread Pitch ..