HM Defense HMB Bolt - Black Nitride Match Barrel are manufactured with 416R Stainless

are manufactured with 416R Stainless Steel with a Rockwell Hardness of C 30-3

2 and HL-X (non-laser)

The product of extensive research

3 grams and include a titanium plunger and a stainless steel roll pin

(3) included gas tube

HM Defense HMB Bolt - Black Nitride Match Barrel are manufactured with 416R StainlessExisting Mil Spec M16 and AR 15 bolts have natural weak point where the cam pin hole passes through the bolt. Under extensive use, including the stress of combat, the bolt can fail at this critical location. The HMB bolt by HM Defense eliminates the pass through cam pin hole and replaces it with a cam pin socket and tapered cam pin design. This new patented design eliminates the natural weak point of Mil Spec bolts by significantly increasing the