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308 AR ENHANCED EXTRACTOR JPEB-308EX

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX – This replacement extractor for DPMS 308AR AR308 pattern .308 bolt assemblies includes our extractor spring/rubber core. JP 308 AR ENHANCED EXTRACTOR JPEB-308EX provides a great upgrade over existing over factory 308 AR extractors.  JP completely redesigned the extractor, using improved materials and heat treatment processes.  This extractor will hold up for thousands of rounds, instead of encountering extraction issues after a few hundred.  Fits DPMS pattern 308 bolts.  Includes extractor and spring.

JP 308 AR ENHANCED EXTRACTOR

JP 308 AR ENHANCED EXTRACTOR

Installation Instructions
Engineered to provide a much longer service life than standard extractors, the JP .308 Enhanced Extractor is an easily swappable component for any DPMS pattern bolt to eliminate extraction problems, premature extractor failure and other malfunctions resulting from the extractor not clearing the case rim. While designed to remedy these extractor‐specific problems, the JP Enhanced Extractor will not solve issues stemming from poor chambering or over‐gassing. If your rifle continues to experience extraction issues with this
component installed, the problem lies elsewhere. Refer to the section below regarding such failures.
To remove your existing extractor, use an appropriately sized punch to drive out the extractor pin. On all current JP EnhancedBolts, this pin can be inserted/removed in only one direction. With the pin out, the extractor will then be easily removable and should retain the extractor spring, which need not be removed from the extractor.
Install the JP Enhanced Extractor in the same manner making sure that the extractor spring with rubber insert and the O‐ring remain in assembly.

ADDITIONAL EXTRACTION ISSUES
Although much development, thought and testing have been put into optimizing the performance and durability of this extractor, it is important to know that other factors enter into an extraction failure and some of these are beyond the ability of any extractor to overcome. If you have a rifle that has extraction issues, it is important to find and address the root causes that may not be related to design deficiencies of the extractor itself. Note that if you see the rim of fired cases slightly bent to the rear from extraction, this is an indication that your rifle is on the verge of not extracting or breaking the rim off the case. These cases should then be discarded and not reloaded. The cause of this should then be determined and addressed.

  1. Over‐pressured ammunition causes the case to extrude into every minor imperfection in
    the walls of the chamber. The case will then stick and fail to release from the chamber during
    the firing process. For reliable extraction, the case must relax and release the chamber
    during the firing cycle.
  2. Port pressure that is too high or too sudden will cause the extractor to break the rim off the
    case before it has a chance to release the chamber. Excessive port pressure causes too rapid
    a pressurization of the bolt/carrier assembly, which in turn attempts to extract the case too
    quickly before it is “ready” to come out. If the port is close to the chamber as in the carbine
    port position, this exacerbates the problem further. An adjustable gas system can usually
    solve this issue.
  3. Micro flaws in the chamber of any self‐loading rifle are an invitation for a malfunction. If the
    chamber has reamer marks, scratches from sand or grit, rust pits or any negative features
    into which brass from the casing can extrude during the firing process, this will literally lock
    the case in the chamber and defeat the best of extractors. If these anomalies are not overly
    severe, the chamber may be recoverable with a good polish. Rust pits, however, usually
    spell the end of a good barrel. A ring depression from a bad or fouled reamer is also not
    recoverable, and the upper will have to be re‐barreled.

 

308 AR ENHANCED EXTRACTOR JPEB-308EX


Brownells Branded 308AR Bolt Carrier Group

Brownells Branded 308AR Bolt Carrier Group www.308ar.com

Brownells Branded 308AR Bolt Carrier Group

Kudo’s to Brownells for increasing their footprint in the 308AR/AR-10 arena. We were pleased to see Brownells is offering a Brownells Branded 308AR Bolt Carrier Group available in phosphate and black nitride.

 

The Brownells 308 AR Bolt Carrier Groups come completely assembled and inspected, ready for use in your next 308AR build.  Bolt is machined from Vac Arc Premium 9310 Carburizing Steel, providing a high core hardness and high fatigue strength.  Bolt is also Magnetic Particle Inspected and shot peened.  Extractor is machined from S7 Tool Steel for extended life.  Carrier is machined from 8620 steel and properly heat treated.  Gas key is machined from 4140 steel and properly staked.  Bolt Carrier Groups are available in the standard, mil-spec Phosphate with a Chrome interior, or with a Black Nitride Finish.  These 308AR BCGs, are Made in the USA.

SPECS: Fits – DPMS pattern 308 rifles.  Materials – Vac Arc 9310 Steel Bolt.  8620 Steel Carrier.  S7 Tool Steel Extractor.  4140 Gas Key.  4340 Cam Pin.  Bolt are magnetic particle inspected and shot peened.

Watvh the Brownells video for additional information

Brownells Branded 308AR Bolt Carrier Group

Brownells AR-10 308AR Bolt Carrier Group

Brownells Bolt Carrier Group


Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group www.308ar.com

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group

Visit Ballistic Advantage for ordering information

Description

  • Carrier Machined from 8620
  • .308 Bolt Machined from 9310
  • Forged Gas Key Properly Staked
  • S7 Tool Steel Extractor
  • Heavy Duty Extractor Spring and Viton O-Ring
  • Grade 8 hardware
  • Shot Peened Bolt
  • HPT/MPI
  • Forward Assist Serrations
  • Carrier, Gas Key, Cam Pin, Bolt, & Extractor coated inside and out with EXO NiB
  • Test Fired complete before shipping to ensure proper function

Ballistic Advantage Nickel Boron 308AR Bolt Carrier Group


Aero Precision Nickel Boron 308 AR Bolt Carrier Group

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

Aero Precision Nickel Boron 308 AR Bolt Carrier Group

There are a couple simple reasons to utilize a Nickel Boron 308 AR Bolt Carrier Group in your 308AR and AR-10 rifles. The Nickel Boron Coating by FailZero is super slippery this means the bolt carrier group can operate with much less lubricant, the bolt carrier group will be easier to clean and the coating should allow the bolt carrier group to outlast the weapon under normal operating conditions. Less wear will also occur in the upper receiver. The finish also looks pretty slick.

The Aero Precision upgraded .308/7.62 Nickel Boron 308AR Bolt Carrier Group BCG is an eye catching addition to your AR build. Mil- spec dimensions and coating ensure the highest quality and correct component interface. Visit Aero Precision

Features:

  • Carrier is machined from 8620 steel
  • Nickel Boron coated
  • Bolt is machined from 9310 steel
  • MPI
  • Forward Assist serrations
  • Weight: 17.92oz

BCG Includes:

  • Bolt carrier
  • Complete bolt
  • Firing pin
  • Cam pin
  • Retaining pin

Specifications:

Weight 17.92oz

Platform 308AR DPMS

Nickel Boron coating by Fail Zero. Learn more about Fail Zero Nickel Boron Coating Services.

Drop-in bolt and carrier group has a self-lubricating surface that eliminates the need to apply oil or grease that can attract dirt, dust, unburned powder, and carbon and lead to cycling failures. Proprietary EXO-treated Nickel Boron finish produces an exceptionally hard surface that’s 40% more wear resistant than chrome plating, with an ultra-low friction coefficient. Surface is actually harder than the substrate underneath and will not peel, flake, gall, or rub off. EXO-treated Nickel Boron finish bolt/carrier groups have been tested to function reliably without additional lubrication up to 50,000 rounds. Reduced friction also means less heat generated by metal-on-metal contact, so the gun runs cooler and parts last longer. Easy to clean, too—fouling brushes right off. Before treatment, parts are shot peened for surface uniformity and magnetic particle inspected to make sure there are no hidden flaws. Gas key is hardened to USGI specs, chrome lined to resist erosion, and comes already staked to the carrier.

Aero Precision Nickel Boron 308 AR Bolt Carrier Group


DPMS 308 Bolt Carrier

DPMS LR-308 Bolt Carrier Group

DPMS .308 bolt carrier parts list and image.

DPMS LR-308 Bolt Carrier Group

 


DPMS LR-308 Bolt Carrier Group Parts

Below is the parts needed to assemble a DPMS LR-308 Bolt Carrier Group. DPMS and part suppliers omit the 308 portion of the part numbers. Example : Bolt Carrier BT-12

  • 308-BT-16 – Firing Pin Retaining Ring
  • 308-BT-12 – Bolt Carrier
  • 308-BT-03 – Extractor Pin
  • 308_BT-17 – Cam Pin
  • 308-BT-02 – Bolt
  • 308-BT-14 – Firing Pin
  • BT-11 – Bolt Carrier Key
  • BT-10 – Bolt Carrier Key Screw
  • 308-BT-07 – Extractor
  • 308-BT-08 – Extractor with Extractor Spring

DPMS LR-308 Bolt