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HM Defense AR-15 5.56/.223 HMB Battle Bolt Carrier Group - Black Nitride

HM Defense AR-15 5.56/.223 HMB Battle Bolt Carrier Group - Black Nitride
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    $125.00
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Hebron, OH 43025

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Product Description

The HMB 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 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 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! Additionally, the HMB 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.

Product Specifications

  • Manufacturer: HM Defense
  • Manufacturer Part #: HMB-BCG-AR15
  • Type: Bolt Carrier Group
  • Color: Black
  • Finish: Nitride
  • 5.56 NATO – 223 Rem – 300 AAC
  • 9310 Steel
  • 4340 Hardened Steel Cam Pin
  • Nitride Black Finish

Customer Comments

Customer Reviews

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(5 out of 5) Bullet Proof
by Jp from Dayton, OH on August 31, 2024

This thing is a tank, and its reliability is second to none. With over 20 years of law enforcement experience, and more than 30 years of shooting, I will only run these BCGs period!

(5 out of 5) Innovative improvement
by Casey from Mason, OH on September 5, 2024

The best bolt group I have ever used. While other manufacturers continue to churn out the same old thing, this company took it a step further to redesign and improve on the weaknesses. Cam pin design is a MASSIVE improvement over all other bolts out there. Just by dropping one of these into your rifle you drastically improve your reliability.