Tag: JP Rifles

JP RIFLES PSC-12 Rifle and Upper Assemblies 308 Side Charger

Received this in my inbox today. Very exciting.

JP RIFLES PSC-12 Rifle and Upper Assemblies 308 Side Charger

The dual-charging PSC-12™ upper assembly features all the utility and advantages of its predecessor, the PSC-11™, available now for large-frame AR platforms. On the heels of the JP side-charge system’s success on our other rifles, the PSC Series not only offers a unique new take on this feature by incorporating both side-charge and traditional top-charge systems into a single upper receiver, but also by making this innovation cross-compatible with existing DPMS LR-308 lower assemblies. The PSC-series combines the great features and performance of virtually our entire rifle line into a single package designed for the all-out tactical market with its redundant charging systems, dust cover and forward assist. In addition, the PSC-12™ is also available as a complete rifle built on a modified version of our LRP-07™ billet lower with the full selection of stock, grip and trigger options available.

Base Rifle Specifications:

Receiver: Machined-from-billet 7075-T6 upper receiver with left-side charging system and modified LRP-07™ forged lower
Receiver Finish: Matte Black Teflon finish over hard coat anodizing on aluminum components
Barrel: JP Supermatch™ 416R air-gauged, button-rifled, cryogenically treated barrel
Barrel Finish: Polished stainless
Muzzle Treatment: JP Compensator
Caliber: .308
Buttstock: A2 or ACE-ARFX
Grip Hogue pistol grip
Hand Guard: JP Modular Hand Guard System
Gas System: JP adjustable
Operating System: JP .308 Low Mass Operating System (LMOS™)
Trigger JP Fire Control Package available in weights of 3.5 – 4.5 lbs.
Accessories: JP accessory pack including operator’s manual, one magazine, GasGunBasics™ DVD and more


As mentioned in a a previous post Brownells has been lstening to what shooters want and they have been adding 308 AR parts almost if not weekly. The latest edition is the JP LOW MASS BOLT CARRIER GROUP JPBC-4BA for 308 AR

JP defies current heavy is better logic of both the AR-15 and AR-308 platforms with the Low Mass Bolt Carriers and in the case of the AR-15 Low Mass Buffer.

I have not seen any analytical data on what system is best in the 308 AR and therefor have no opinion other than JP RIFLES knows the 308 and they have been doing it longer than most. Their rifles constantly win competitions.

I plan on contacting JP for a better explanation.




Here’s what JP says about the LOW MASS 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.

Stay tuned..