Complete HMB Bolt with Cam Pin. 5.56 NATO - 223 Rem - 300 AAC; 9310 Steel; 4340 Hardened Steel Cam Pin; Nitride Black Finish ; Drop in Bolt for Mil-Spec Carriers; Lower 48 States (Local and State Laws Apply)

Made in the USA. Since 1991. Staking the gas key on the AR-15 and M-16 carrier. What Makes Our Bolts and Carriers Different? Young Manufacturing, Inc © 2025 All Rights Reserved.

2022年1月5日 · Get a drop-in upgrade for your rifle with the ultra-durable HMB bolt from HM Defense. Enjoy free shipping on orders over $50!

Substantial improvement in long-term durability over Mil-Spec bolt; Comes with enhanced tapered cam pin; Specifications: Caliber: 5.56 NATO / .223 Rem. / 300BLK; Material: Bolt: 9310 Steel; Cam Pin: 4340 Hardened Steel; Finish: Black Nitride; Weight: Bolt: 1.55 oz. Cam Pin: 0.25 oz. Compatibility: AR-15; Includes: 1x HM Defense HMB Battle Bolt ...

Bolt. The bolt is one of the most important parts of the bolt carrier group. Machined from 9310 steel, a proprietary flash nitride process was chosen to ensure proper heat treatment on the bolt. When properly heat treated, 9310 steel provides superior strength and durability when compared to …

The HMB Bolt is an upgraded bolt for AR rifles that adresses the main weakness in the AR bolt design. Instead of leaving the user with two small wings of material for the bolt to cam against the cam pin the machining doesn't go all the way through. The bolt includes a shortened pin to make it a drop-in installation process.

From a simple QD End Plate to the HM 5.56 Muzzle Brake, every component produced by HM is an innovation you can count on to serve on the long haul. These aren’t “flash-in-the-pan” aesthetic improvements, HM Defense makes real innovations that elevate the performance of the weapon systems they’re introduced to.

2019年5月7日 · One method for improving the AR’s reliability is the HM Defense Bolt. As fine a weapon as it is, the AR’s design has a failure in the making. The bolt of the AR-15/16/M4 and that of the AR-10, have an opening for the cam pin. Possibly for production efficiency, the cam pin hole is drilled straight through the bolt.

Explore precision-engineered firearm components at HM Defense Bolt Store. Discover a range of high-quality bolts designed to enhance your shooting experience. Crafted with meticulous attention to detail, HM Defense offers innovative bolt solutions to ensure reliable performance and accuracy in your firearms.

This patented design eliminates the natural weak point of Mil-Spec bolts by significantly increasing the amount of metal at the cam pin location. It is 100% compatible with Mil-Spec M16 & AR-15 BCGs and can installed as a drop-in bolt replacement in any existing M16 or AR-15 rifle.