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.
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All VSO M4GERY "red" come with this installed. Its a great option for an upgrade or if you purchased a "Red" it is an excellent idea to have a duty and training bolt.
All canceled, refunded, or returned orders are subject to a $20 restocking fee. Shipping costs will not be refunded if charged.
