Existing 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 amount of metal (and strength) at the cam pin location. The result - no more broken bolts.
Additional benefits of the HMB design include the elimination of the cam pin hole staking, reduction in potential cam and firing pin contact and a smoother operation of the bolt carrier group.
Best of all the HMB is 100% compatible with Mil-Spec M16 and AR-15 BCGs and can be installed as a drop-in bolt replacement in any existing M16 or AR-15 rifle.
The HMB bolt is manufactured by Young Manufacturing and is the same bolt that is offered as an upgrade on the Young Manufacturing National Match M16 BCG - considered to be one of the finest BCGs available.
