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The Colt ERP, or Enhanced Patrol Rifle, line of M4 Upper Receivers that come with Centurion Arms free float M-LOK® handguards, making for a convenient and practical upper receiver ready to drop on your AR-15 lower receiver.

Available in 3 different barrel lengths, each is chrome lined, has a 1-7 twist, is button rifled, and has a phosphate finish.

You can also choose between complete, which includes a M16 bolt carrier group and charging handle or stripped which does not include those items.

All NFA rules apply.

 


Big Book Catalog, Issue:73, Page:003

COLT - M4 ENHANCED PATROL RIFLE 5.56 UPPER RECEIVER GROUPS

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Out of Stock

Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Carbine

Length: 11.5"

Muzzle: 1/2-28, ...

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Backorder, See Associate
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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: Complete

Length: 16"

Muzzle: 1/2-28

Twist: 1-7

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In Stock

Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Length: 14.5"

Muzzle: 1/2-28

Twist: 1-7