JP High Performance Operating System Components

JP Low Mass Operating System

We have our own purpose designed operating systems. For the no-compromise competition rifle, the LMOS™ offers the most significant improvement in the felt impulse of the rifle as compared to any modification other than the addition of a compensator. The complete system consists of our low mass bolt carrier and lightweight buffer conversion kit. By reducing the reciprocating mass, the overall impulse as felt by the shooter is further reduced, and bolt velocity is increased without significantly affecting reliability. JP LMOS™ equipped rifles have virtually no reciprocating mass feel.

Reliability with these parts is excellent for competition use. We've been using this system for three years without a malfunction at a match. Most shooters that use and maintain this operating system feel that it is a great performance improvement. Some shooters have even reported fewer unexplained flyers in their groups with the JP LMOS™ system.

The JP Low Mass Carrier works out nicely in the new type of civilian machined receivers like ours and the DPMS High and Low Rider series that don’t have a forward assist. Although it doesn’t have the forward assist serrations, it functions in military type receivers. It just won’t allow the use of forward assist on the receiver. Dust cover functions normally.

You may be wondering why our stainless carriers appear black. This is due to a new state of the art surface finish for stainless called QPQ (Quench, Polish, Quench). This is a five-step process resulting in a rock hard surface with natural lubricity. Some want the bright polished look and that is available on the JPBC-3 Low Mass carrier, but not the JPBC-2 tactical carrier.

The JP LRP-07 has our large format AR-10 type Low Mass carrier. The JPBC-4 AR-10 low mass stainless bolt carrier is also finished in black QPQ hard coat for superior wear and natural lubricity. The JPBC-4 will also improve the sight recovery on the DPMS LR-308 or the Armalite AR10. However, it must be used with a DPMS LR-308 bolt assembly, firing pin, cam pin and firing pin retainer.

Do not attempt to use the JPBC-4 with the Armalite bolt assembly, firing pin or cam pin. Unlike the AR-15/M16 platform on which just about everything is cross compatible, each AR-10 type rifle such as the JP LRP-07, DPMS LR-308, Armalite AR-10, Knights SR-25 or Rock River AR-10 is inherently different with only limited cross compatibility of components. Always check compatibility anytime you order aftermarket accessories for AR-10 type rifles.

JP Tactical Operating System

For police tactical duty or any application where absolute reliability is the main criteria, we have our TOS™ or Tactical Operating System with 416 stainless steel special design carrier that includes forward assist serrations and a dust cover notch. The bore of the JP stainless carriers has a roller burnished finish for frictionless operation with no chance of peeling chrome as in standard mil-spec carriers. The exterior bearing surfaces are hand polished. When properly lubricated, both systems make your rifle feel like it was cycling on ball bearings.

Both the JPBC-2 and the JPBC-3 feature a 100% increase in bearing surface for smoother operation and improved alignment and lower wear in the upper receiver. Both are M15 semi auto configuration in the rear with the mil-spec longer cocking pad in the front for best reliability. This is hands-down the best designed and highest quality general purpose carrier on the market. Sold as carrier with installed key.

Also available is the JPBC-16 for select fire M-16 weapons same as above but with the M16 full auto configuration. This component is not available in the web store as you must supply your NFA registration form or order on an LE or Military purchase order. Call to order.

Note that it is unadvisable to use any full auto components in an AR-15 semi-auto rifle. If you happen to have an unexplained “double” (more than one round firing with one press of the trigger), you could be prosecuted for manufacturing and possessing an illegal weapon.

JP High Performance Bolt assembly with extractor by Leitner-Wise Defense

Bit by bit, we continue to improve the over-all system of the AR-15/AR-10 rifle. Now we finally have a high performance bolt and extractor to match our outstanding bolt carriers. Standard Mil-spec 8620 bolts and extractors have a number of Achilles heels, so to speak. The result is a life expectancy of about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds. Other problems include cracking at the cam-pin hole and weak extractor spring tension.

The material used in standard bolts is also not the best choice by today's standards, but if you remember the old story that explains why “Mil-spec never dies,” that applies here also. They make them this way because they’ve always made them this way.

Our new bolt is made from SAE 9310 high grade steel. With this material, an extremely hard surface with a tough ductile core resistant to structural failure is provided resulting in a ten-fold improvement in life expectancy. This has been observed in actual full auto endurance torture tests. SAE 9310 is the same type of steel used in the transmission gears of "formula one" race cars. The high load application of a bolt assembly is the ideal application for this state of the art material.

In addition, many other fine points have been addressed such as incorporating radiuses in all the traditional 90º corners of the locking lug areas and other features. This further enhances the ability of the bolt to handle high loads over a much longer life span. The LWD bolt is standard equipment on the JP CTR-02 rifles and uppers and an optional upgrade on the JP-15 or JP-15/VTAC rifles. We highly recommend it as a compliment to your JP high performance bolt carriers or any rifle system. It sounds expensive by comparison, but for most people, it is a lifetime part. Look at it this way, it’s three times the price, but lasts 10 times as long. It’s actually a bargain.

Back to top

Back to top

New Video Gallery

Related Products

Barrels Heat Sinks Bolt Carriers Modular Hand Guards Gas Systems Recoil Eliminators Tactical Compensators Fire Control Components Stocks and Grips

© 2009 JP Enterprises. All rights reserved.