• Full mass bolt carrier
• High pressure bolt
• Melonite QPQ treated
• Ideal for rifles without tunable gas systems
• Forward assist serrations
• Includes one peice gas ring
• Compatible with Armalite and DPMS patterns

Weight: 1lb. 2.7 oz.

The JP Full Mass Operating System With HP Bolt is designed for optimal reliability. The full mass carrier allows for additional cycling delay over other more lightweight option. Since the carrier of the FMOS is QPQ Nitride treated there is less preventative maintenance required when you are cleaning your carrier. The high pressure bolt is a great feature, however it does not allow for excessive pressures that are over SAMI specification. Whether you have an Armalite or DPMS rifle you can use this BCG in accordance with it. 

The LMOS is compatible with both DPMS and Armalite, but you should never mix the two types of parts when not buying a complete BCG.

For more info, visit JP Enterprises