October 2017
Mt. Orab, Ohio – HM Defense announces the release of its all-new HMBTM Bolt, an enhanced durability bolt for M16, AR-10 and AR-15 rifles. The HMBTM Bolt corrects a natural weak point in existing Mil-Spec M16, AR-10 & AR-15 bolts where the cam pin hole passes through the bolt. Under extensive use, including the stress of combat, a standard Mil-Spec bolt can fail at the cam pin hole location.

The HMBTM 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 patent-pending 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!
“The HMBTM Bolt design provides a substantial improvement in long-term durability over the existing Mil-Spec bolt,” said Clay Barker, General Manager at HM Defense. “Every M16 and AR rifle can benefit from our new HMB TM Bolt design”
Additionally, the HMBTM Bolt reduces contact between cam pin and firing pin, enabling smoother operation of firing pin, bolt lugs and aft gas rings. The new cam pin socket also retains lubrication for extended operations.
The HMBTM Bolt is 100% compatible with Mil-Spec M16 & AR-15 BCGs and can be installed as a drop-in bolt replacement in any existing M16 or AR-15 rifle. The HMBTM Bolt will be standard on all HM Defense HM15 rifles and available as an HM Defense bolt replacement kit or in a complete HMBTM Bolt Carrier Group starting in September 2017.

For more information on the HMBTM Bolt and other HM Defense technologies, please visit HMDefense.com.