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CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver w/ Free S&H — 5 models

CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
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CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
2 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
3 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
4 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG
5 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
6 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
7 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
8 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
9 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG
10 of 10 images
CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG

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Questions & Answers
Is 1/7 the correct barrel twist for this upper?

No, 1:10 is correct. Also, the barrel threading is 5/8-24, not 1/2-28.

by Some Guy, Verified Owner, July 28, 2025
Will this fit a stag arms ar10 lower Assy? Expert Answer

The CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver is based on the DPMS Gen 1 LR308 pattern of rifles. I would recommend contacting Stag Arms directly in order to confirm the lower you have will be compatible with DPMS Gen 1 upper receivers.

by Ethan, Gear Expert, October 23, 2023
View All Q&A You Have a Question? Ask!
5 Models Available
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ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver

With a commanding barrel length of 24 this .308 WIN ENDEAVOR Mk3 Upper Group is purpose built for long-range performance. Quality is always top concern, thats why the 416 stainless steel barrel is nitrided for maximum corrosion resistance that doesnt sacrifice ballistic performance. The CMMG Mk3 platform is based on the popular LR-308/DPMS Gen 1 High-Pattern design. Check out our CMMG Resources article to learn more about the Mk3 platform.image

WARNING: California`s Proposition 65

Specifications for CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver:

Manufacturer: CMMG
Caliber: .308 Winchester
Barrel Length: 24 in
Barrel Profile: Medium Tapered
Gas System Length: Rifle Length
Barrel Twist Rate: 1-7
Muzzle Device: CMMG Zeroed Muzzle Brake
Fabric/Material: 6061-T6 Aluminum
Gas Block Journal Size-Diameter: .750 in
Gun Rail: M-LOK
Gun Type: Rifle
Gun Make: CMMG
Gun Model: CMMG Mk4
Weight: 4.5 lb
Magazine Included: No
Mount Type: M-LOK
Threads per Inch: 1/2x28

Package Contents:

  • CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver

What firearm models does the manufacturer say CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver is compatible with?

The manufacturer suggests that CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver is compatible with CMMG Mk4

CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver Orderable Models

List of Orderable Models

  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Midnight Bronze, 38B4BC8-MB , MPN: 38B4BC8-MB , UPC: 810097502871 , Code: 2CM-URC-CP31-38B4BC8-MB
  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Titanium, 38B4BC8-TI , MPN: 38B4BC8-TI , UPC: 810097502895 , Code: 2CM-URC-CP31-38B4BC8-TI
  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Charcoal Green, 38B4BC8-CG , MPN: 38B4BC8-CG , UPC: 810097502857 , Code: 2CM-URC-CP31-38B4BC8-CG
  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Sniper Grey, 38B4BC8-SG , MPN: 38B4BC8-SG , UPC: 810097502888 , Code: 2CM-URC-CP31-38B4BC8-SG
  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Tungsten, 38B4BC8-TNG , MPN: 38B4BC8-TNG , UPC: 810097502901 , Code: 2CM-URC-CP31-38B4BC8-TNG

CMMG Mk3 .308WIN 24in Endeavor Upper Group Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • CMMG Mk3 .308WIN Endeavor Upper Group Receiver, 24in, Coyote Tan, 38B4BC8-CT , MPN: 38B4BC8-CT , UPC: 810097502864 , Code: 2CM-URC-CP31-38B4BC8-CT
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Last updated 2026-07-29 UTC.