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  • CMMG Receiver Extension Castle Nut MK4 Black Matte, Fits AR-15 Carbine Receiver Extensions.
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  • AR-15
  • AR Parts
  • CMMG Receiver Extension Castle Nut MK4 Black Matte, Fits AR-15 Carbine Receiver Extensions.

CMMG Receiver Extension Castle Nut MK4 Black Matte, Fits AR-15 Carbine Receiver Extensions.

MPN: 55CA9CB  |  UPC: 815835017426
$9 01

In Stock


Available for purchase in 47 states See States
Available for purchase in all U.S. States except:
  • California
  • Illinois
  • Washington
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PRODUCT DESCRIPTION

The CMMG Receiver Extension Castle Nut MK4 is a replacement castle nut designed for use with AR-15 and MK4 carbine receiver extensions. Its matte black finish offers durability, and it is compatible with a range of AR platforms where a castle nut is required.

  • Matte black finish for durability and corrosion resistance
  • Compatible with AR-15 and MK4 carbine receiver extension tubes
  • Designed as a castle nut for buffer tube installation

This component is suitable for maintaining or assembling AR-15 and MK4 platforms, ensuring secure buffer tube retention and reliable function.

    This item is not available to ship to the following state(s):
    California | Illinois | Washington
SPECS
Finish Matte
SKU ACC-CMMG-55CA9CB
Country of Manufacture No
License Requirement None
Manufacturer CMMG
Mfg. Part Number 55CA9CB
UPC 815835017426
Caliber/Gauge N/A
Action N/A
Barrel Length N/A
Barrel Twist N/A
Barrel Bore Type N/A
Barrel Finish N/A
Barrel Fluting N/A
Barrel Profile N/A
Mount Type N/A
Beam Color N/A
Firearm Fit N/A
Threaded Barrel No
Condition New
Free Shipping No
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