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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: 153 Write a review »

  0 of 0 people found the following review helpful:
Awesome upper August 22, 2018
Reviewer: TG from Riverside, CA United States  
This site is great. They always ship quickly and everything has been in great shape.

I also love this upper. The only thing close to a blem I could find was on the shell deflector, which is going to get dinged up after the first shot anyway. The nickel Teflon seems to be applied well and feels great and smooth. It also looks great. I wish I would have found these before I invested in other uppers.

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  1 of 1 people found the following review helpful:
Still looking May 3, 2018
Reviewer: Nick from VA United States  
Just got this upper and cant find  blemishes anywhere, cant wait to put some rounds through it.  Awesome deal!

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  1 of 1 people found the following review helpful:
Supper fast shipping March 22, 2018
Reviewer: Anonymous Person from San Jose , CA United States  
Got it in 2 days. The coating looks and feels great

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  0 of 0 people found the following review helpful:
Woah December 22, 2017
Reviewer: Anonymous Person  
Upper looks great, REALLY had to look hard to find the blemish. Sealed VERY tight with Faxxon gunner barrel. Looks like the picture, grey, matte, not super shiny like nickel boron BCG's. Ordered some cerakote samples to find a good match for a lower.

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  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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