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2/3/2020 7:23:45 PM EDT


AR/M16 Bolt Carrier Group  Micro-Polished Titanium Nitride  HPT/MPI

Micro-Polished Titanium Nitride BCG - $245.99    $174.00
  • Components coated in Titanium Nitride, which is the staple of Physical Vapor Deposition (PVD) hard coatings, solves "tribological" problems with machine components that can be coated at temperatures of 800-850 Fahrenheit.
  • "Tribology" is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication, and wear.
  • This Nanocrystalline technology is accomplished by embedding Nanocrystalline (AICrN) grains into an amorphous matrix. Advancements allow for the formation of higher nanohardness coating with greater thermal stability than conventional coatings.
  • Applied using a lateral rotating cathode technology in a PVD process, materials are vaporized from a solid source in the form of atoms/molecules and then transported in the form of vapor through a vacuum, low pressure gas/plasma to the substrate where it condenses. Following the coating process the components are Micro-Polished to achieve an amazing luster that performs under conditions of high load with higher reliability over other conventional coatings.
  • Advantages of this coating include abrasion resistance, chemical resistance, corrosion protection, extreme temperature resistance, high wear resistance, extreme hardness, oil/fuel resistance, increased lubricity, low coefficient of friction, oxidation resistance, and low thermal conductivity.
  • Bolt precision machined from 9310 alloy; carburized/case hardened & shot peened (PVD Coated)
  • HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent, without evidence of failure
  • MPI testing after above, 100% inspection per ASTM E1444 using a standard 5 turn magnetizing coil with a current of 200 to 300 amperes. Circular and longitudinal continuous magnetization and a wet fluorescent solution shall be used. Conformance to MIL-STD-410 is required within ASTM E1444
  • Extractor, machined 4140 Tool steel alloy (PVD Coated)
  • Extractor Pin, precision machined and ground AMS6440/52100 Bearing grade steel retaining pin
  • Extractor Spring, 5 coil, ASTM Grade A 228 wire stock, stress relieved, Tensile Strength of 393,000 PSI Max, 80 Durometer Per AMS-R-6855 black insert
  • Extractor Spring O-Ring, Viton (FKM) Fluoropolymer Elastomer
  • Ejector, S7 shock resistant tool steel alloy, hardened, shot peened per ASTM B851/SAE AMS2430, manganese phosphate
  • Ejector Spring, ASTM Grade A 228 wire stock, heat treated, stress relieved  Tensile Strength of 376,000 PSI Minimum
  • Gas Rings, Steel Corrosion Resistant Per AMS 5906  X3
  • Carrier machined from 8620 alloy, full auto profile, heat treated, ultrasonically cleaned, hard chrome bore (PVD Coated)
  • Gas Key machined from 4130 chromoly steel alloy, heat treated, hard chrome internal (PVD Coated)
  • Socket Cap Head Screw, steel, grade 4037 per ASTM, heat treated & manganese phosphate 2x
  • Gas Key is installed with Permatex aviation gasket sealer, torqued to 55-foot pounds, pneumatically steaked and break away tests performed to spec
  • Cam Pin, precision machined 4340 chromoly steel alloy, heat treated (PVD Coated)
  • Firing Pin, precision machined 8740 steel alloy, heat treated, precision ground & hard chrome plate
  • Firing Pin Retaining Pin, carbon steel ASTM A510, heat treated & manganese phosphate
  • All material, components and packaging made in the USA
E2armory.com is committed to providing the highest quality firearm components that meet all rigorous military specifications.
2/3/2020 8:00:21 PM EDT
[#1]
Looks great.  That's nice polishing work.  How does the TiN finish react to repeated usage?  Can you clean the carbon off it, or do you just live with the residual?
“The best people possess a feeling for beauty, the courage to take risks, the discipline to tell the truth, the capacity for sacrifice.” — Ernest Hemingway
2/3/2020 8:12:56 PM EDT
[#2]
I absolutely dont need it.  Wow, I do want it.
Words fall from your mouth like shit from ass.
2/3/2020 10:23:03 PM EDT
[#3]
Quote History
Originally Posted By AvalonRifle:
Looks great.  That's nice polishing work.  How does the TiN finish react to repeated usage?  Can you clean the carbon off it, or do you just live with the residual?
View Quote
Its easy to clean. We ran 1,200 rounds last month to show it to a lot of folks who where wondering the same. Video is on Insta:  Cleaning Micro-Polished TiN
E2armory.com is committed to providing the highest quality firearm components that meet all rigorous military specifications.
2/3/2020 10:23:33 PM EDT
[#4]
Quote History
Originally Posted By Steamedliver:
I absolutely dont need it.  Wow, I do want it.
View Quote
how many?
E2armory.com is committed to providing the highest quality firearm components that meet all rigorous military specifications.
2/3/2020 10:24:55 PM EDT
[#5]
Quote History
Originally Posted By Steamedliver:
I absolutely dont need it.  Wow, I do want it.
View Quote
A closer look at the Micro-Polished Titanium Nitride Bolt Carrier Group from E2 Armory. (I typed all of that just for you)
E2armory.com is committed to providing the highest quality firearm components that meet all rigorous military specifications.
9/15/2021 12:55:24 PM EDT
[#6]
You asked for thoughts.  I like a lot of your stuff but on this one, I'll take a hard pass.  It will be great for the guys who only shoot at the range and spend most of their time there bragging about having the most 'expensivest' and prettiest rifle there with only the most 'in' most tacticool stuff.  You know, the same guys who pay $$$$$ for a Shamrock on their take down and pivot pins.  Too bad I have never met one of those guys that could actually shoot worth a damn.  All show, no go.  Black Nitride is about as Gucci as I can get.
Join the N.R.A.
Beware speaking with a sharp tongue as you are apt to cut your own throat.
My name is John Wick, you killed my puppy, prepare to die.
9/28/2021 10:52:52 PM EDT
[Last Edit: CanNevrHaveEnuffGuns][Edited] [#7]
I like the look and if the finish can hold up to hard use, I’d be interested. That price is fair if the carrier lasts a good long time.
12/25/2021 9:15:47 AM EDT
[#8]
Nice looking BCG and price point is reasonable for those who wants more blings in their ARs.
12/25/2021 9:22:56 AM EDT
[#9]
I would try one if you had a low mass carrier.
"They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety."
Ben Franklin
12/28/2021 4:41:40 PM EDT
[#10]
All my ARs are pretty straightforward, no expensive addons, except for one, my "Jack" is like Puff Daddy going down the red carpet.
NRA member
GOA member
Dog lover
Please donate to Gun Owners Foundation
5/31/2023 7:49:32 PM EDT
[#11]
Quote History
Originally Posted By Big-Bore:
You asked for thoughts.  I like a lot of your stuff but on this one, I'll take a hard pass.  It will be great for the guys who only shoot at the range and spend most of their time there bragging about having the most 'expensivest' and prettiest rifle there with only the most 'in' most tacticool stuff.  You know, the same guys who pay $$$$$ for a Shamrock on their take down and pivot pins.  Too bad I have never met one of those guys that could actually shoot worth a damn.  All show, no go.  Black Nitride is about as Gucci as I can get.
View Quote

i will piggy back off this:

as someone who used to drink Jim Jones' kool aid with respect to BCG coatings, i was surprised to see my brand new knights upper have a phosphate carrier.

the more i shot this upper, the more i realized there is absolutely nothing wrong with a properly applied phosphate coating. i dont notice any sort of difference between this phosphate carrier and other nitrided carriers i have. even shooting suppressed.
1/13/2024 8:50:41 PM EDT
[#12]
Is HPT actually beneficial, or does it damage the bolt steel?
Genuinely curious.
4/25/2024 1:42:39 PM EDT
[#13]
Quote History
Originally Posted By badkarmaiii:
Is HPT actually beneficial, or does it damage the bolt steel?
Genuinely curious.
View Quote


It certainly can. HPT may shorten the lifespan of the part. The tradeoff is that you know the part won't bust on the first shot.

I prefer not questioning if it's going to bust on the first shot


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