JP AR15 LMOS BCG with JP Enhanced Bolt JPBC-3A


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JP AR15 LMOS BCG with JP Enhanced Bolt JPBC-3A

JPBC-3A | Low Mass AR15 Bolt Carrier Group | QPQ Black Finish

JP AR15 LMOS BCG with JP Enhanced bolt is 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.  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

Beyond their design features, our stainless LMOS™ carriers come in one of two finish options. The stainless models undergo a vigorous polishing process.  This brings out the steel’s natural luster for an eye-catching component.  The final finish is worthy to be kept in a jeweler’s cabinet.   Alternately, our black models undergo a state-of-the-art, multi-vendor process known as QPQ (Quench-Polish-Quench).  The finished product offers a durable rock-hard surface with remarkable natural lubricity and sheen.

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-3A
Platform:  AR15
Material:  QPQ Black Finish
MSRP:  $352.95

Weight 13 oz
Dimensions 10 × 3 × 3 in

JP Enterprises

Part Type

Bolt Carrier Group, Upper Receiver Parts





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