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Add the Colt legend of reliability to your rifle or build with these complete upper receivers from Colt. These Uppers are based off the combat proven M4 upper receiver and feature 1/7 RH twist in a chrome lined, button rifled barrel.  Available with a 16”, 14.5” or 11.5” barrel. Available with or without a charging handle, bolt carrier group, and back up sights. All NFA rules apply.


AR-15, Issue:11, Page:003
Big Book Catalog, Issue:72, Page:003

COLT - M4 5.56 COMPLETE UPPER RECEIVER GROUPS

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Carbine

Length: 11.5"

Muzzle: 1/2-28, ...

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Length: 16

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Cartridge: 223 Remington, 5.56 mm NATO

Finish: Black

Style: Complete

Length: 14.5

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Out of Stock

Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Carbine

Length: 14.5"

Muzzle: 1/2-28, ...

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New
Backorder, See Associate
Pre-Order

Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Carbine

Length: 11.5"

Muzzle: 1/2-28, ...

click details to view more....

Backorder, See Associate
Out of Stock

Cartridge: 5.56 mm NATO

Finish: Black

Style: Assembled

Length: 16.1

Muzzle: 1/2-28

Twist: 1-7