BCM® Upper Receiver - M4 Flat Top (M4 Feedramps) Complete (Unassembled) - DEMO/Scratched

MSRP: $129.00
Your Price: $89.95
(You save $39.05 )
(1,381 reviews) Write a Review
Maximum Purchase:
10 units
Machined from 7075T6 Forgings
Stock Status:

BCM® M4 Flat Top Upper Receiver with cosmetic blemishes. Most have scratches or scuffs.
The upper comes unassembled, but complete with BCM forward assist assembly and ejection port cover door assembly.
You must assemble it. (Assembly required) (all parts, but you will have to assemble together)
THESE ARE USED/DEMO UPPER RECEIVER ASSEMBLIES. All will have several nicks, scratches, and marks on exterior finish. NO HANDPICKING.
This receiver has the M4 feedramps machined in. This is to be used with barrels that include the M4 barrel extension.

Built to the correct Mil-Specs.
(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun or hair dryer to warm up threaded bore of receiver if barrel extension is too tight.)


Precision machined to correct Mil-Specs from 7075 T6 Forgings
NOT Assembled with forward assist, and ejection port cover
Mil-Std 1913 Rail for mounting optics and accessories
Machined for use with barrels that use an M4 barrel extension
Laser etched T-markings for addressing the remounting of optics
Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
Hard Coat Anodized per Mil-A-8625F, Type III, Class2
Dry Film Lube on interior bore per Mil-Specs
Made in the U.S.A. (of course)

This product will not include the BCM® logo laser etched on the receiver. It is marked BCM4 over the gas tube hole.

***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***

1,381 Reviews

  • 5
    Blem AR15 Upper

    Posted by John W. on Aug 17th 2021

    If there was a blem I couldn't find it. T marked rail, heat fit extension to receiver mating. Thumbs up!

  • 5
    Blem Upper

    Posted by Chris on Aug 17th 2021

    Not a scratch on it that I could find, very happy.

  • 5
    BCM blem stripped upper

    Posted by Mitch on Aug 16th 2021

    This thing is perfect in every way looks amazing how it is considered a blem I don't know. On the other hand instillation on the barrel is ruff even with heat had to hammer in the barrel with a piece of wood and mallet even after heating the whole upper hot enough I couldn't touch it this thing is amazing the quality is top notch but if your looking for a easy barrel insulation this is not for you!

  • 5
    Quality parts

    Posted by Stan Koppang on Aug 16th 2021

    I bought one blemished upper receiver in 2019 and was so pleased with it I decided to buy 2 this time.

  • 5
    Upper reciever blemished

    Posted by curt on Aug 15th 2021

    Couldn't find the blemish, a really good price on a great product

  • 5
    BCM Upper Receiver Flat Top M4

    Posted by Ken on Aug 15th 2021

    Listed as a demo/scratched blem but it was perfect! When I installed my barrel it was a nice tight fit (which I like) and with a little muscle and a heat gun it seated perfectly. Always top notch quality from BCM!

  • 5
    Best "Blem" I've ever received

    Posted by Eric B on Aug 8th 2021

    Great blem upper. The blem was not physical at all (no dents or dings) as much as a blemish in the finish. One side has a "crystaline" look to the finish that is barely noticeable. That's it. The rest is the normal BCM we all expect. The tight fit on the barrel extension is the best part for me. Dry lube on the inside and it runs very smoothly so far.

  • 5
    Can't find flaw

    Posted by Russell on Aug 8th 2021

    I build and service guns as a side job for several years now and can't find anything wrong with this upper. No dings or finish problems and measurements I could check were spot on.

  • 5
    Wonderful quality

    Posted by Mike W on Aug 8th 2021

    Perfect fit and finish is outstanding for a "blem" . Extremely glad I found this company. BCM will be my first stop for any parts I need in the future.