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Q&A for JP Enterprises Complete JPBC Bolt Carrier Group (BCG) — 29 Questions & 26 Answers

Name JP Enterprises Complete JPBC Bolt Carrier Group (BCG) (5)
As Low As $460.75 Save Up to $25.25
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Q
AJ, member, from NY, United States, asked on June 20, 2018

WILL THIS FIT MY 80% ARMS UPPER

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on October 10, 2018

This MAY fit your 80% receiver. You will need to confirm compatibility with whoever manufactured your receiver. Please be aware that JP Enterprises lists this note on compatibility on their website:

"Compatibility

This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in .308 Winchester, 7.62x51 NATO or other cartridges requiring the longer magazine format.

Be aware that these receiver platforms are not standardized like the AR-15/M16 platform for which most parts are cross-compatible. Before ordering accessories and parts for your large-format rifle, make sure the parts are compatible with your particular platform. This bolt carrier is compatible only with the DPMS family of AR-10 products.

With the Armalite family of large-frame receivers, this carrier can only be used as a complete bolt carrier assembly group with a DPMS-pattern bolt such as our .308 JP EnhancedBolt. Interchanging individual components will result in an unsafe configuration. Do Not under any circumstances mix and match components between the platforms."

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Q
Bird, member, from AZ, United States, asked on November 13, 2025

What is the weight?

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A
Answered by Ethan, Gear Expert, from IL, United States, on November 13, 2025

Full mass models weigh 18.3 oz. Low mass models weigh 14.25 oz.

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Q
Chad Whitworth, member, from TX, United States, asked on August 16, 2022

What’s main difference between low mass and full mass? I’m building a 20” AR10 in .308, which works with better?

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A
Answered by Ethan, Gear Expert, from IL, United States, on August 19, 2022

Low Mass (LMOS) equipped rifles have virtually no reciprocating mass feel and move less during cycling, allowing for much faster sight recovery and follow-up shots. This is more ideal for competition style rifles. Full mass (FMOS) are designed for police duty or any application where absolute reliability is the main criteria. FMOS carriers also feature a 100% increase in bearing surface for smoother operation, improved alignment and lower wear in the upper receiver as well as a longer Mil-spec cocking pad for optimal reliability.

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Q
FS, guest, from TX, United States, asked on July 08, 2022

Will the low mass work with my 308 M5 enhanced for the new 8.6 blackout round? I am running a 12" barrel with an adjustable gas block.

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on July 22, 2022

Yes, the JP Enterprises Complete JPBC Bolt Carrier Group should work fine with that set up. The JP Enterprises Complete JPBC Bolt Carrier Group will work with DPMS pattern rifles like the Aero Precision M5. Since the 8.6 Blackout uses a 6.5 Creedmoor case the JP Enterprises Complete JPBC Bolt Carrier Group bolt will work.

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Q
Guntiger, member, from WA, United States, asked on May 09, 2022

Do the high pressure bolts have titanium firing pin, or steel?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on May 23, 2022

The JP Enterprises Complete JPBC Bolt Carrier Groups high pressure bolts have a stainless steel firing pin.

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Q
Dumard, guest, from RJ, Brazil, asked on January 30, 2022

Is it compatible with the Palmetto PA 10 308 rifle?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on February 02, 2022

Yes, these JP Enterprises Complete JPBC Bolt Carrier Groups will work in a PSA AR10 in .308.

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Q
C.D. Flippin, member, from NC, United States, asked on November 10, 2021

Is this bolt compatible with DPMS Gii patter rifles? Like a Remington R25.

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A
Answered by Ethan, Gear Expert, from IL, United States, on January 05, 2022

Yes. The JP Enterprises Complete JPBC Bolt Carrier Group is DPMS compatible.

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Q
AB, member, from RI, United States, asked on September 03, 2021

Does this require an adjustable gas block?

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A
Answered by Patrick, Gear Expert, from IL, United States, on October 22, 2021

This will be compatible with both adjustable and fixed gas blocks

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Q
Dman, guest, from CA, United States, asked on June 10, 2021

Will this work for 6.5 creedmoor aero m5

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A
Answered by Patrick, Gear Expert, from IL, United States, on October 22, 2021

Yes, this should be compatible.

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Q
Mason, guest, from TX, United States, asked on May 06, 2021

Is it ready to slap in a rifle and use out of the box

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A
Answered by Patrick, Gear Expert, from IL, United States, on October 22, 2021

Yes, this BCG is drop in ready.

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