Colt 10.3" CQB 5.56 Upper Receiver - MK18 Clone
Lowest Listed Price
$599.99
MSRP
$0
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Aug 26, 2026
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Specifications
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Description
Colt 10.3" CQB 5.56 Upper Receiver - MK18 Clone
Manufactured by Colt
Made in the USA
Police LEO trade-ins
Colt M4 CQB 10.3" 5.56 barrel w/ low profile gas block
Production years will vary
Colt M4 upper receiver ("C" or CAGE code marked, Cerro Forge or Brass Aluminum Forge marked)
Larue Tactical 9.0 free float quad rail
*No Bolt Carrier Group is included*
Charging handle style will vary
A2 style birdcage flash hider (may not be clocked properly need adjustment)
Rated Good or better surplus condition
Limit one per customer
These Colt 10.3-inch CQB 5.56 upper receivers are U.S.-made, police trade-in uppers built with genuine Colt 10.3-inch M4 CQB barrels, Colt upper receivers marked with either a "C" or CAGE code and forged by Cerro or Brass Aluminum Forging, and LaRue Tactical 9.0 free-float quad rails. They include charging handles, though the styles may vary, and A2 birdcage flash hiders that may require proper timing, but they do not include bolt carrier groups. Production years vary, and each upper is rated in good or better surplus condition, making them solid options for those looking for dependable Colt-based 10.3-inch uppers or a foundation for MK18-style clone builds.
