JP Enterprises, ULMOS Ultra Low Mass Bolt Carrier Group w/JP EnhancedBolt, 223/5.56

For the no-compromise competition rifle, our Low Mass Operating System (LMOS™) offers the most significant improvement in the felt impulse of the rifle compared to any modification other than the addition of a compensator. By reducing the reciprocating mass within the operating system, the bolt velocity is increased while simultaneously reducing the overall impulse experienced by the shooter with each shot. Consequently, LMOS™ equipped rifles have virtually no reciprocating mass feel and move less during cycling, allowing for much faster sight recovery and follow-up shots.

While use of the LMOS™ components is recommended only for competition and sporting use, this is only precautionary as their reliability is excellent, particularly on rifles with adjustable gas systems. Like all our bolt carrier designs, LMOS™ carriers feature a 100% increase in bearing surface for smoother operation, improved alignment and lower wear in the upper receiver as well as the longer Mil-spec. cocking pad for optimal reliability. In fact, Team JP shooters have been using the LMOS™ system for over a decade without any reported operating system malfunctions at a match, and most every shooter that implements this operating system feel that it is proven to be a great performance improvement. Some shooters have even reported fewer unexplained flyers in their groups after switching to the LMOS™ system.

For small-frame rifles, the complete JP LMOS™ system consists of one of our low mass bolt carriers and our lightweight buffer conversion kit, but any LMOS™ component can be installed individually in your existing setup and run smoothly. Click on the tabs above to see more about the different LMOS™ carrier models we offer.

FEATURES (CARRIER)

• Ultra Low Mass
• Small-Frame
• 7075 T6 Aluminum
• Anodized

FEATURES (BOLT)

• SAE 9310 steel construction for superior resiliency and extended lifespan
• Chromium nitride PVD coating provides extreme surface hardness while maintaining a ductile core
• Near frictionless surface finish
• Fully compatible with Mil-spec sub-components
• Increased diameter cam pin hole eliminates most common bolt breakages
• Improved lug geometry for reduced wear and easier locking/unlocking
• Enhanced Ejector mitigates head case extrusions and reduces brass smear
• Enhanced Extractor optimizes extraction function and eliminates common ejection failures
• Enhanced Gas Ring reduced internal friction and carrier wear while maintaining near indefinite gas seal