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Nickel Teflon Upper Receiver (M4 Flat Top) - Complete ***BLEM***
M4 Flat Top Blemished Nickel Teflon AR-15 Upper Receiver

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Our Price: $179.00
SALE PRICE: $99.99
Savings: $79.01

Stock Status :IN STOCK

Product Code: NTUS-BLEM


Complete Nickel Teflon Upper Receiver (M4 Flat Top) w/ Blemishes

Electroless Nickel Teflon has continually proven to outperform traditional Anodizing and Phosphate coatings by leaps and bounds! The increased reliability, corrosion resistance and ease of maintenance make this upgrade a no-brainer. PLEASE NOTE: These uppers are being sold at a discounted rate due to minor imperfection in the base metal. These imperfections are very common but are usually hidden when anodized. Nickel Teflon does not hide them as well. In no way shape or form will these blemishes affect functionality.


  • Forged & machined by Cerro Forge (Key Hole)
  • Machined From mil-spec 7075 T6 forging
  • M4 feed ramps
  • Proprietary electroless nickel teflon finish
  • 100% increase in corrosion resistance compared to MIL-A-8625 hard coat anodizing
  • 240% increase in lubricity compared to MIL-A-8625 hard coat anodizing
  • 160% increase in lubricity over hard chrome

Nickel Teflon will buff out and produce polished spots on contact/friction points. When using a clamshell type receiver block, the contact points may cause slight discoloring on the exterior of the receiver. This of course is strictly cosmetic. However, if you’re trying to avoid discoloration then we recommend using a (pin type) receiver vise. The inside diameter for barrel extension is slightly undersized for a tighter fit to the barrel and a more accurate rifle.


  • Run it longer and harder - Lubrication optional. If you decide to use lube you won’t notice when it dries up. The natural lubricity of Nickel Teflon has a much lower coefficient of friction than phosphate treated steel with lube applied.
  • Lubricity and wear resistance - Lubricity plays an essential role in optimizing wear resistance and longevity. Nickel Teflon has a .05 Coefficient Of Friction (COF), creating a surface more slick than Anodizing, Hard Chrome or even Nickel Boron.
  • Longevity - Has a Hardness of Rockwell 54. Guaranteed not to peal or flake
  • Ease of maintenance - No scrubbing required. Carbon fouling literally just wipes off with a rag.
  • Corrosion resistance - We apply a proprietary Electroless Nickel substrate with a higher than average phosphorus content, giving the coating a barrier that’s practically impenetrable by corrosion.

Average Rating: 5 of 5 Total Reviews: 149 Write a review »

  0 of 0 people found the following review helpful:
Another awesome RTB product November 18, 2017
Reviewer: Kevin B from CA United States  
I bought two of these  for builds I was doing with my son. Whatever the blems may be we don’t notice them. The BCGs slide through these so slick. We put 200 rounds the rifles this weekend and everything functioned perfectly. Cleaning was easy & showed no wear or issues with the coating. We can definitely recommend these uppers.

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  0 of 0 people found the following review helpful:
What Blem?? July 15, 2017
Reviewer: JAMES JENSEN from SAN JOSE, CA United States  
This upper looks amazing, wish I could of bought 2.

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  0 of 0 people found the following review helpful:
What blem? July 11, 2017
Reviewer: Victor from TX United States  
I can not find a blem on this thing. It's a great looking upper and is a perfect match to the fail zero bcg. Super fast shipping.

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  0 of 0 people found the following review helpful:
where is the blem? May 20, 2017
Reviewer: Jd from USA  
where is the blem?

can't find a blemish on this one, maybe no "T" marks?

would be nice if it had ptfe coated port doors and FA button-- haven't sot it yet , so this review is provisional. fit and finish are in spec and looks good.

very nice for the cost-- i may buy a few more--

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  0 of 0 people found the following review helpful:
Nickel Teflon Upper Receiver (M4 Flat Top) BLEM May 11, 2017
Reviewer: Mopar Murphy from ELKINS PARK, PA United States  
Nice product, I could find the blem, but it truly was microscopic & unnoticeable-found it only because I was searching for it. I can't find a comparable product like this anywhere on the internet-this is a reasonable deal for what you get.

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