AR15 JP Rifles LMOS Aluminum BCG JPBC-1


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AR15 JP Rifles LMOS Aluminum BCG JPBC-1

JPBC-1 | Low Mass AR15 Bolt Carrier | Aluminum

JP AR15 Aluminum LMOS JPBC-1 Bolt Carrier is 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.  Since it reduces the reciprocating mass within the operating system, the bolt velocity is increased.  This reduces 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.  Therefore 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.  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.  Also, it offers improved alignment and lower wear in the upper receiver.  The carrier has a 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.  Secondly, most every shooter that uses 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.

Surface and Finish

JP Rifles reintroduced a new-and-improved and easier to run ultra low mass carrier manufactured from aircraft-grade 7075-T6, the reborn JPBC-1.  It has been remade with lower maintenance requirements.  Because the new JPBC-1 is the ultimate in improved reliability and performance.  Team this carrier with a high-efficiency JP muzzle brake, adjustable gas system and Silent Captured Spring.  The end result is a carrier that leaves your .223 shooting like a rimfire .22.

The JPBC-1 weighs in at 2.9 ounces less than our 416 LMOS carrier and 0.7 ounces less than even the titanium carriers offered on the market today.  Each unit comes as a complete kit including our JP precision-ground, one-piece gas ring as well as a titanium firing pin. Run in concert, this gas ring ensures perfect bore-to-gas seal fitment in the JPBC-1 and minimized friction to enhance reliability when fouled.  Lastly, the titanium firing pin eliminates any possibility of slam fire at the higher bolt velocities.

Arm or Ally carries the JP Silent Captured Spring.  Also, check out our extensive AR Barrel inventory.  If you need more parts or looking to upgrade your AR15, view our full line of AR Parts.

Additional Information

Manufacturer:  JP Enterprises
Part #:  JPBC-1
Platform:  AR15
Material:  7075-T6 Aluminum
MSRP:  $339.95

Weight 4 oz
Dimensions 10 × 3 × 3 in

JP Enterprises

Part Type

Bolt Carrier Group, Upper Receiver Parts



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