Colt M4 Upper Receiver Assembly

SKU: CTSP63528
MPN: CTSP63528
Manufactured by Colt
1 Reviews



In Stock

NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.

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In Stock


This Colt Manufacturing M4 Complete Upper Receiver is built to Mil-Spec dimensions from high quality materials. Forged from 7075-T6 aluminum and hardcoat anodized, this AR-15 upper receiver is the perfect component for your next duty style rifle. It comes with the forward assist and dust cover already assembled and features M4 feed ramps and compatibility with all AR-15 style barrel nuts. The flat top picatinny rail allows you to attach optics and a back-up rear sight. With Colt reliability and an affordable price, you can’t go wrong with this upper receiver.

  • Forged 7075-T6 aluminum
  • Hardcoat anodized black
  • M4 flat top picatinny rail
  • M4 feed ramps
  • Includes dust cover and forward assist

Colt Manufacturing knows firearms. They have been designing them since the first patent made by Samuel Colt in 1836 and they know what it takes to bring quality products to the market for both military and civilians. If you want a firearm proven by time, you can’t go wrong with a Colt.


AssemblyAssembled Uppers
Feed RampsM4
FinishHardcoat Anodized
Forward AssistAssembled with Forward Assist
Port DoorAssembled with Port Cover
Receiver Material7075-T6 Aluminum
T MarksT-Marked

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

1 review

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New Colt--Cage code + Square forge

by -

Cage code. Square forge. Quality seems good enough. We've gotten to a point where you really need to trust your retailer when buying parts advertised as Colt. I do happen to trust Primary Arms, so no worries, but the fakes are getting good enough that I wouldn't even consider buying from a less credible source. Stay off the forums. Stay away from the gun shows. Lots of fakes going around these days.