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Q&A for CMMG Bolt Carrier Group (BCG), AR15, 6.5 Grendel/6mm ARC — 5 Questions & 4 Answers

Name CMMG Bolt Carrier Group (BCG), AR15, 6.5 Grendel/6mm ARC (4)
$199.95 $182.49 Save $17.46
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Q
Jojo, member, from OR, United States, asked on April 04, 2021

Will a .243 Winchester cartridge work well with this thanks

Expert Answer
A
Answered by Nick B., Gear Expert, from IL, United States, on October 29, 2021

CMMG states that this bolt is only for AR-15 platform firearms chambered in 6.5 Grendel or 6mm ARC.

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Q
Rosie, member, from NC, United States, asked on January 05, 2021

What material is big made from?

Expert Answer
A
Answered by Ryan Tarczynski, Gear Expert, from IL, United States, on September 29, 2021

Bolt: 9310 Steel, Phosphate Finish
Carrier: 8620 Steel, Chrome Lined, Phosphate Finish
Extractor: 4140 Steel, Phosphate Finish

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Q
KeithVue, member, from GA, United States, asked on October 25, 2020

Is this bcg also fined tuned by CMMG to have the Radial delayed blowback for 6.5 grendel?

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A
Answered by Nick B., Gear Expert, from IL, United States, on October 29, 2021

The manufacturer does not note any such enhancements or features.

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Q
KeithVue, member, from GA, United States, asked on October 25, 2020

Which type of 6.5 grendel with this work with? Type 1 or type 2?

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A
Answered by Nick B., Gear Expert, from IL, United States, on October 29, 2021

This is Type 2.

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Q
Ren, member, from CO, United States, asked on September 28, 2024

Do you need to do anything to the BCG or just drop in ready to go?

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Last updated 2025-11-12 UTC.