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

MSRP: $129.00
Your Price: $59.95
(You save $69.05 )
(1299 reviews) Write a Review
Machined from 7075T6 Forgings
Stock Status:

Out of stock


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.***

1299 Reviews

  • 5
    upper receiver

    Posted by Thomas F Spatuzza on Aug 11th 2020

    great price,fast shipping.fitting went easy. just finished and hopping to get to the range soon.

  • 5
    Great upper for a build

    Posted by Chris on Jul 17th 2020

    Being a dent/demo upper, I was expecting at least a few scratches, etc. but there was only a barely noticeable blemish. I used this upper in conjunction with an Aero Lower and a SOLGW SS 16” .223 Wylde Bbl, along with BCM Furniture. I have been getting sub moa results. The receiver provides an extremely tight fit for the barrel used. I set my wife’s blower dryer on high for about 12 minutes to heat up the upper enough and had to use an oven mitt to connect the two. The lower receiver also mated well to the upper and though the lower has one of these tension screws, it is wholly unnecessary. There is hardly any slack between the upper and lower receiver. Great product. Keeping my eyes open for when they will be in stock again for a pistol build.

  • 5

    Posted by Francis on Jul 7th 2020

    One of the best I have used will get more of them

  • 5
    Blem upper

    Posted by Z V on Jun 29th 2020

    Top notch quality. I always love buying BCM. There is something to be said about a company whose blemished parts are still of better quality than competitors. Don't ever hesitate buying BCM, you're buying quality parts.

  • 5
    Blemished upper

    Posted by Mike on Jun 28th 2020

    The description says that this upper will have. blemishes on it. I found absolutely nothing wrong with this upper. This is my first BCM purchase and it certainly will not be my last. Look forward to purchasing more BCM parts in the future.

  • 5
    blemish upper

    Posted by Tom Enlow on Jun 27th 2020

    This is my 6th rifle build and first BCM upper. I'm very impressed in fact from now on I'll be using or suggesting BCM uppers to everyone.. Even more for a blemish Thank You and Semper FI

  • 5
    Demo/Blem upper

    Posted by Ike on Jun 24th 2020

    Slight risk purchasing this upper, risk was absolutely worth it. Could not find a single surface scratch or damage. Quality not compromised with this purchase.

  • 5
    Bolt carrier and Upper

    Posted by ALex Mestre on Jun 23rd 2020

    The ONLY rifle Company I'll trust my life with.

  • 5
    Blem upper

    Posted by Rob on Jun 23rd 2020

    This was my first blem part,I was worrying until it arrived. If this is a blem can't wait to order parts that pass your tests.