This video discusses the HTM Defense HMB Bolt, an aftermarket AR-15 bolt designed to enhance strength by not milling the cam pin hole all the way through. This modification aims to address common failure points in standard AR-15 bolts, particularly around the cam pin area, by increasing the material's circumference and thus its resistance to stress during operation. The presenter intends to test this bolt in a high-stress rifle over a year to evaluate its durability.
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