For the no-compromise competition rifle, the 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. Specifications for JP Enterprises Complete JPBC Bolt Carrier Group (BCG) .223 Caliber: Manufacturer: JP Enterprises Cartridge: .223 Remington Gun Model: AR-15 Gun Frame Size: Small Hand: Right Condition: New Features of JP Enterprises Complete JPBC Bolt Carrier Group BCG: Reduced stroke length for faster firing impulse Designed for optimal function for a heavier operating system that reduces bolt bounce while improving reliability and accuracy Tighter firing pin channel to reduce pin wear High-energy tumble process offers a finer cosmetic finish Includes firing pin and retainer pin Package Contents: JP Enterprises Complete JPBC Bolt Carrier Group
BubbaGump –
I got this because Krieger Barrels will only chamber to a JP bolt. The cut is different than a standard BCG: It will not let the dust cover close unless the BGC is either locked back or fully in battery. It has extra bearing surface to ride in the upper receiver. The parts move with almost no friction.
Winston –
This is by far the lightest carrier I have ever used. Typical of JP, build quality is flawless, finish and color perfect, and overall look is a 10. I am using this in a JP billet upper and combined with a Noveske “Navy” 9” barrel in 300blk. I have not put it through it’s paces much as of yet. What I have found in running it is that the hammer on a stock AR trigger assembly will strike the front of the opening in the carrier and cause the finish to crack or break away. This does not seem to happen with a slimmer or reduced weight hammer found in a drop in or aftermarket trigger upgrade. I will be using these in more builds, especially any I do where weight is a concern.
ThirtyCal –
This BCG is flawless, light, and offers an impeccable cycle. JP states this BCG is not for duty. I have had no problems cycling any type of 300BO with this BCG. After 1000 rounds I see no signs of wear. Also using JP silent capture H2 and JP adjustable gas block. These are both a must to maximize this BCG's potential and longevity. Especially with pistol gas. The key is not to over gas this BCG and keep it clean. If done, I don't see any reliability problems. I am certain this BCG does not have the longevity of a tool steel carrier. But like many high end AR products, it is about pushing limits. For that you may not get duty longevity. For fast cycling, low recoil applications this is the best. Plus it's nice looking. In my opinion its duty life to dollar is worth the replacement and continuation of use.
Jeffro –
You won't ever go wrong with JP stuff. It's a little pricey, but buy once, cry once. This is well made. Beautiful machining. Try the Silent Captured Spring system also. Optics Planet is the way to go. Fast shipping.
William Woods –
Always had great luck with JP parts. Triggers in the past. Now this BCG…. it is super light, fast, and runs great after tuning with my hydraulic buffer and a custom ported gas tube (not a fan of adjustable gas blocks). I also own, let's see, 4 JP Enhanced Bolts, 2 of which are custom headspaced to Shilen barrels. Buy with confidence (except I think I got the last one….).
Steve Lawrence –
The quality of this BCG and bolt are amazing. Highly exceeds MIL Spec. The coating is superb and feels like it is highly oiled without oil…still apply oil of course. I have yet to fire it, but I'm pretty sure it will function flawlessly.