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Questions & Answers
Do I just need BCG, Barrel and magazine to convert AR-15 from 556 to 6.5 Gren?

Yes, that's correct. There may be some other incompatible parts such as gas block and muzzle devices due to barrel diameter differences but that is all that should be necessary from a mechanical perspective. I would also highly recommend an adjustable gas block for Grendel.

by Profmunchkin, Verified Owner, March 17, 2025
Color:
Black
Finish:
Salt Bath Nitride
Barrel Length:
16 in
Barrel Profile:
Medium Tapered
Gas System Length:
Rifle Length
Gas Block Journal Size-Diameter:
.750 in
Barrel Twist Rate:
1-8
Flutes:
No
Gun Make:
CMMG
Weight:
1.55 lb
Firearms Threads Per Inch:
5/8x24

Code: 2CM-ATB-CP12-64DCF0C

MPN: 64DCF0C

UPC: 810046230763

List: $239.95Save 14%
$205.99

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Product Info for CMMG 6.5 Grendel 16in Barrel Sub-Assm

Build up your own 6.5 Grendel by utilizing one of CMMGs dedicated 6.5 Grendel barrel sub-assemblies.image

WARNING: California`s Proposition 65

Specifications for CMMG 6.5 Grendel 16in Barrel Sub-Assm:

Manufacturer: CMMG
Color: Black
Finish: Salt Bath Nitride
Fabric/Material: 416 Stainless Steel
Barrel Length: 16 in
Barrel Profile: Medium Tapered
Gas System Length: Rifle Length
Gas Block Journal Size-Diameter: .750 in
Barrel Twist Rate: 1-8
Flutes: No
Gun Make: CMMG
Weight: 1.55 lb
Firearms Threads Per Inch: 5/8x24

Package Contents:

  • CMMG 6.5 Grendel 16in Barrel Sub-Assm

CMMG 6.5 Grendel 16in Barrel Sub-Assm Orderable Models

List of Orderable Models

  • CMMG Barrel Sub-Assm, 16in MT 416SS, 6.5 Grendel, Salt Bath Nitride, 64DCF0C , MPN: 64DCF0C , UPC: 810046230763 , Code: 2CM-ATB-CP12-64DCF0C
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