+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
FREE SHIPPING & FREE RETURNS*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

CMMG MK3 Receiver Extension and Stock Kit Up to 16% Off w/ Free Shipping — 2 models

CMMG, Inc Receiver Extension and Stock Kit, A1, Mk3 38CA964
CMMG, Inc Receiver Extension and Stock Kit, Carbine, Mk3 38CA953
CMMG, Inc Receiver Extension and Stock Kit, A1, Mk3 38CA964
1 of 2 images
CMMG, Inc Receiver Extension and Stock Kit, A1, Mk3 38CA964
CMMG, Inc Receiver Extension and Stock Kit, Carbine, Mk3 38CA953
2 of 2 images
CMMG, Inc Receiver Extension and Stock Kit, Carbine, Mk3 38CA953

Tap Tap to Zoom

Questions & Answers
will this fit an m4 carbine ar15 Expert Answer

The CMMG, Inc MK3 Receiver Extension and Stock Kit is meant for the MK3 .308 platform of CMMG rifles. It uses a .308 carbine buffer and .308 spring. It will not be compatible with AR15 pattern rifles.

by Ethan, Gear Expert, October 4, 2023
what is the specs on this? fully extended length and so on? Expert Answer

The CMMG, Inc MK3 Receiver Extension and Stock Kit (MPN:38CA953) features/includes a milspec buffer tube (7.25") and 6-position buttstock. The stock kit (MPN:38CA964) features/includes an A1 rifle length buffer tube (10") and A1 Rifle fixed buttstock. Specific lengths are not provided by the manufacturer. I'd recommend reaching out to them directly for more information.

by Ethan, Gear Expert, November 14, 2022
View All Q&A You Have a Question? Ask!
2 Models Available
Additional Features
All
Search
Click to select this item for your bundle offer!

Buy Together and Save

As low as $137.37
You Save Up to 25%
Receive $2.68 OP Bucks

Product Info for CMMG MK3 Receiver Extension and Stock Kit

Designed to work in either direction, this receiver extension and A3 pistol grip stock kit will convert any .308 WIN platform firearm to a proper MK3 platform firearm. The receiver extension features two QD flush cups on either side for mounting the included A3 pistol grip and AR-15 style buttstock. The buttstock is constructed of an injected-molded, high-strength polymer for durability, and features a full-length, adjustable cheek-piece and polymer extension stubby tube for customizing the look of your MK3 even more. This receiver extension and stock kit will work on any 308 WIN platform firearm but may require slight fitment fitting/fit behind a .308 WIN barrel. **NOTE: Magazine extensions will NOT fit .308 WIN barrels. Check manufacturer recommendations to ensure a proper fit.image

Specifications for CMMG MK3 Receiver Extension and Stock Kit:

Manufacturer: CMMG
Color: Black
Buffer Tube Size: Mil-Spec
Gun Model: CMMG Mk3
Length: 15 in
Condition: New
Condition Quality: Excellent
Condition Details: Other
Gun Make: CMMG
Weight: 2 lb
Fabric/Material: Aluminum, Polymer

Package Contents:

  • CMMG MK3 Receiver Extension and Stock Kit
  • 6-position M4 Buttstock
  • CMMG 6-position mil-spec Receiver Extension (Buffer Tube)
  • Buffer Tube Castle Nut
  • Receiver Endplate
  • .308 Carbine Buffer
  • .308 Carbine Action Spring

CMMG MK3 Receiver Extension and Stock Kit Orderable Models

List of Orderable Models

CMMG, Inc Receiver Extension and Stock Kit, A1, MK3, 38CA964 , MPN: 38CA964 , UPC: 815835016573 , Code: 2CM-FBS-308WINNBTT-38CA964
CMMG Receiver Extension and Stock Kit, Carbine, Mk3, Black, 38CA953 , MPN: 38CA953 , UPC: 815835016566 , Code: 2CM-FBS-308WINNBTT-38CA953

CMMG MK3 Receiver Extension and Stock Kit Unavailable & Discontinued Models

List of Unorderable Models

USED CMMG, Inc Receiver Extension and Stock Kit, A1, MK3, 38CA964, EDEMO1, Used, Condition Fair, Scratches , MPN: 38CA964-EDEMO1 , Code: 2CM-FBS-308WINNBTT-38CA964-EDEMO-SC-D
Compare (0)
1 item has been added
Add at least two items to compare