Cryptic Coatings Mystic Black Bolt Carrier Group

Cryptic Coatings Mystic Black Bolt Carrier Group

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Cryptic Coatings Mystic Black .308 Winchester Bolt Carrier Group

Cryptic Coatings Mystic Black Bolt Carrier Group .308 Winchester

Recently I was researching 308 Bolt Carrier Groups for our CT Other Light Weight AR-10 build and I decided to go with a Toolcraft BCG as that’s the brand BSF Barrels uses to headspace their Carbon Fiber Barrels like the one I bought for the aforementioned 308 build mentioned above. Unfortunately, I couldn’t locate the Toolcraft BCG I needed but some additional research lead me to Cryptic Coatings, specifically their Mystic Black Bolt Carrier Group.

I spent a decent amount of time reading Cryptic Coatings Mystic Black Bolt Carrier Group Reviews and decided I MUST buy one. Unfortunately, the Mystic Black in .308 Winchester was out of stock. I was bummed out but not deterred as Primary Arms let me backorder one BCG. I also decided to send an email to Cryptic Coatings. To my surprise, I received a call from the wonderful Karen H of Cryptic Coatings who graciously offered to save me one from the next run of .308 Mystic Black Bolt Carriers.

Three days later the Primary Arms order was delivered and about a month later Karen called me again to tell me my BCG had shipped. So yes I now own two very nice and expensive Cryptic Coatings Mystic Black Bolt Carrier Groups.

Available from Palmetto State Armory, and Primary Arms

Cryptic Coatings Bolt Carrier Group Mystic Black .308 Winchester

Founded in January 2014, Cryptic Coatings specializes in bolt carrier groups and BCG coatings. With an ever-expanding product line, their BCGs and coatings offer reduced friction, longer lifespans, and increased performance, backed by their lifetime warranty.

This Bolt Carrier Group includes a MIL-SPEC 8620 aircraft quality steel carrier with a shot-peened carpenter no. 158 steel bolt. The DPMS cut carrier is compatible with most DPMS pattern AR’s on the market and features a shrouded firing pin, a chrome-lined interior, and a properly staked, chrome-lined gas key secured with grade 8 fasteners. The bolt assembly includes a tool steel extractor with spring and Viton O-ring. A chrome-finished firing pin is also included.

Cryptic BCGs are finished in one of six different coatings, each offering reduced friction, increased performance, and greater wear resistance than that of a standard bolt carrier group.

Cryptic Coatings Bolt Carrier Features:

Mystic Black – .308 Winchester
Chemical vapor deposition coating
Coefficient of friction: 0.01
Hardness: 3000 Vickers
Maximum temperature: 1,000 degrees Fahrenheit
High pressure tested
Magnetic particle inspected
8620 aircraft quality steel carrier
Heat treated to 60-61 RC
Chrome lined carrier interior
Chrome lined gas key
Gas key staked with grade 8 screws
Carpenter 158 steel bolt
Tool steel extractor
Viton O-ring
Chrome finish firing pin
MIL-SPEC cam pin

Cryptic Coatings Bolt Carrier Specifications:

Bolt Finish: Chemical Vapor Deposition
Bolt Material: Carpenter 158 Steel
Brand: Cryptic Coatings
Caliber Gauge: .308 Win
Carrier Finish: Amorphous Carbon CVD
Carrier Material: 8620 Carpenter Steel
Carrier Style: DPMS Pattern Carrier
High Pressure Tested: High Pressure Tested
Magnetic Particle Inspect: Magnetic Particle Inspected
Platform: AR-308, AR-10, 308AR

Links to Other 308 AR | AR-10 | AR 308 Content

LANTAC .308/7.62X51MM Enhanced Full Auto Style Bolt Carrier Group NiB Coated E-BCG

LANTAC .308/7.62X51MM Enhanced Full Auto Style Bolt Carrier Group NiB Coated E-BCG

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Lantac Enhanced BCG Full Auto Style E-BCG Enhanced Bolt Carrier Group 308

LANTAC .308/7.62X51MM Enhanced Full Auto Style Bolt Carrier Group NiB Coated E-BCG

I find it interesting that two of the most expensive .308 bolt carrier groups are designed with philosophies that are 180 degrees apart. The JP Low Mass 308 Bolt Carrier Group is a lightweight BCG that must be used in conjunction with JP Rifles Low Mass Recoil System. On the other end of the spectrum is the Lantac E-BCG .308 part number LA00300. In a market of “me too” inexpensive bolt carrier groups Lantac differentiates itself with superb quality, brilliant engineering and patents that deliver one of the best performing BCG’s available.

The Lantac E-BCG is designed to be weight balanced from front to back. This makes for a pretty heavy bolt carrier group. The added weight increases lock time and should theoretically reduce recoil. That additional mass combined with the BCG’s NiB coating lubricity equates to smooth cyclic function. Lantac has designed “Port Forward” channels into the carrier body to direct gases out and away from the bolt. Suppressed shooters will really benefit from these features. Lantac designed a round gas key or “smooth cam”. To me this is a halfway point between the POF gas key which is a ball bearing and a standard square gas key. The Lantac E BCG cost about twice as much as traditional quality carriers and that hasn’t stopped it from becoming wildly popular. In fact other manufacturers such as ADM offer it for sale among their own hardware. Lastly it’s a crazy sign of the times wen you can spend $300-$450 on a 308 bolt carrier and for about one third more buy a cheap and complete AR-308/AR-10.

Visit Lantac to Learn More

Lantac Enhanced BCG Full Auto Style (.308/7.62) LANTAC E-BCG™, Enhanced Bolt Carrier Group.

The LANTAC E-BCG Enhanced Bolt Carrier Group is precision machined from 8620 Steel with a shot peened bolt manufactured from Carpenter 158 and Magnetically Particle Inspected. The entire carrier assembly is NiB, Electroless Nickel Boron coated with the patented, advanced UCT EXO process, unlike standard NiB coatings. This offers extreme lubricity with a friction coefficient of .02 and surface hardness of 82-85 Rockwell C.

The carriers patent pending design features unique shrouded and forward facing gas ports that have also been re sized so that gas is vented differently to a standard carrier. This results in a system that runs flatter with a smoother energy pulse. In addition, the system also runs cooler and cleaner and there is also less pressurization of the upper receiver when running a suppressed barrel. The flared boss at the tail of the carrier enhances the BCG’s lock position within the upper and makes it more consistent, resulting in an accuracy improvement.

All critical dimensions are hard turned / ground after heat treat and the bore of the carrier and gas key have been hard chrome lined for the best possible wear resistance. All E-BCG’s feature the LANTAC CP-R360 patent pending domed cam pin that is machined from 17-4PH Stainless Steel and hardened to H900 condition (45RC approx). The ultra-smooth head reduces wear within the upper receiver. Gas keys are properly staked at four points and only grade 8 fasteners are used in assembly.

Enhanced BCG Full Auto Style (.308/7.62) LANTAC E-BCG™, Enhanced Bolt Carrier Group.

AR10 Full Auto Style for increased mass and lock time.
Our DPMS Style 308 BCG is precision machined from 8620 Steel with a 9310 Precision Hard Ground Bolt.
The entire carrier assembly is NiB, Electroless Nickel Boron coated with the patented, advanced UCT EXO process, unlike standard NiB coatings.
This offers extreme lubricity with a friction coefficient of .02 and surface hardness of 82-85 Rockwell C.
The carriers patent pending design features unique shrouded and forward facing gas ports that have also been re sized so that gas is vented differently to a standard carrier.
This results in a system that runs flatter with a smoother energy pulse.
In addition the system also runs cooler and cleaner, there is also less pressurization of the upper receiver when running a suppressed barrel.
The flared boss at the tail of the carrier enhances the BCG’s position within the buffer tube at the time of cycling and allows for a flatter more controlled reciprocation of the assembly.
All critical dimensions are hard turned / ground after heat treat.
All E-BCG’s feature the LANTAC CP-R360-H™ patent pending domed cam pin that is machined from 17-4PH Stainless Steel and hardened to H900 condition (45RC approx).
The ultra smooth head reduces wear within the upper receiver.
The BCG’s weight helps to increase lock time with smoother operation.
Gas keys are properly staked at four points and only grade 8 fasteners are used in assembly.

The E-BCG’s forward porting and unique shape assist in reducing pressurization inside the upper receiver that can be caused by short barrel rifles running suppressors.
However, it should be noted that the E-BCG™ is not a complete solution for this issue and all rifles are different. ‘Over Gassed’ guns will suffer to a larger extent from this problem.

Weight 1Lb 2.1oz

DPMS Pattern
Forward Porting, Enlarged Vents.
Balanced flared boss.
8620 Carrier, Heat Treated, Hard Turned.
9310 Bolt, Hard Turned / Ground.
NiB UCT EXO Coating.
CP-R360-H Domed Cam Pin
Mil-Spec Gas Rings
Mil-Spec Staked Gas Key
Grade 8 Hardened Fasteners
All Hard Chrome surfaces are to MIL-STD-171 1.2.2.2
Lifetime Warranty.
Made in the USA.

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WMD NiBXBCG308-N 308 AR Bolt Carrier Group w Nitromet Carrier

WMD NiBXBCG308-N 308 AR Bolt Carrier Group w Nitromet Carrier

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WMD NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier

WMD Guns NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier is a welcome addition to the ever growing field of 308 AR bolt carrier groups available to shooters today. For the price of a common phosphate 308 bolt carrier group WMD Guns offers a high performance alternative that features the slippery, corrosion and wear resistant Nitromet QPQ coating as well as a heavy duty buffered extractor. The NiBXBCG308-N offers a good option for suppressor equipped 308 rifles.

Visit or 308 AR Bolt Carrier Page

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WMD NiBXBCG308-N 308 AR Bolt Carrier Group with Nitromet Carrier

SKU:NiBXBCG308-N

Check out the WMD Guns NiBXBCG308-N 308 AR Bolt Carrier Group Specs:

Bolt – 9310 heat-treated. Milspec gas rings. NiB-X coated (Rc70, 40% more wear-resistant than chrome).
Extractor – Manufactured, heat treated, and hardened per government drawings. Black extractor, buffer and heavy-duty spring. NiB-X coated.
Firing Pin – Manufactured, heat-treated, hardened, chromed and certified per government drawings.
Carrier – 8620 material, heat-treated and case hardened. Manufacturing tolerances on inside diameters tightly controlled. Nitromet QPQ processed for Rc55 surface hardness, durability and corrosion protection.
Gas Key – Hardened to USGI Specifications and attached using grade 8 hardened fasteners. NiB-X coated. Staked per military specifications.
Cam Pin – Manufactured, heat treated, hardened and certified per Government drawings. NiB-X coated.
Weight:1.17 lbs

What is Nitromet QPQ?

NITROMET™ SALT BATH NITRIDING MAXIMIZES RESISTANCE AGAINST CORROSION AND WEAR

Salt bath nitrocarburizing (SBN) is a popular alternative to hard chromium and physical vapor deposition (PVD). More effective
than hard chromium, SBN is extremely economical, with an array of well-documented benefits.

COST-EFFECTIVE HIGH PERFORMANCE COATING

Enhanced wear resistance
Increased corrosion resistance
Improved case hardness (extends wear surface)
Multiplied fatigue strength
Higher lubricity

Nitromet is a proprietary KC Jones trademark, originally developed by Kolene Corporation. Nitromet enhances the properties of SBN to provide optimal protection against corrosion and wear.

Nitromet Salt Bath Nitriding Available exclusively from KC Jones

Plating Engineered for enhanced wear and corrosion resistance : Choose from 2 finishes:
Standard – Quench Polish Quench® (QPQ), Uniform black finish, Deep, rich, black color, Case hardening, Conforms to materials standard ASTM 2753C, Surface hardness = 56 HRC (minimum)

Salt bath nitriding is sometimes referred to as ferritic nitrocarburizing, as well as salt bath nitrocarburizing. It is a process that involves thermo chemical diffusion, where a compound layer of carbon and nitrogen is simultaneously introduced to the surface of ferrous metal parts. A variety of metals can be treated with salt bath nitriding, including carbon steel, stainless steel, and sintered and cast iron parts.

Primary Nitromet Salt Bath Nitriding Characteristics

Deep black finish Anti-seizing properties
Improved sliding
Uniform black color
Doubled bending fatigue
Doubled rotary bend strength
Zero galling (often associated with plated surfaces)

Nitromet salt bath nitriding is an economic way to increase resistance against corrosion and wear. This is true whether you seek a hard chrome replacement or a more economical solution.

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308 AR Bolt Carrier Group Nitride Coated Brownells

Brownells adds a Nitride Coated, Magnetic Particle Inspected BCG to their 308 Bolt Carrier Lineup. The bolt carrier group comes in at a cost of $169 which is lower than name brand phosphate coated 308 AR Bolt Carrier Groups.

Brownells 308 AR Bolt Carrier Group Nitride Coated MP Inspected

Brownells 308 Winchester, DPMS/SR-25 Pattern, Complete Bolt Carrier Group with Nitride finish, featuring Magnetic Particle Inspected, 9310 Bolt.

Brownells complete 308 Bolt Carrier Group includes all the components necessary to drop into your 308, DPMS/SR25 pattern AR and start running. The black nitride version offers a superior finish, which provides excellent corrosion resistance, while retaining lubricity. All components are properly machined & heat treated, with the heart being the 9310, Magnetic Particle Inspected Bolt. This testing ensures that the bolt is free of defects, and the 9310 steel will hold up to the harshest shooting regimen, especially the powerful 308 Winchester, 7.62x51mm NATO or other variant cartridges.

Complete 308 Bolt Carrier Group includes:

Fully assembled Bolt Carrier Group; including the bolt, bolt carrier, gas key, firing pin, cam pin, and firing pin retaining pin
Every Bolt is Magnetic Particle Inspected (MPI)
The Bolt is machined from 9310 steel
Following machining, the Bolt is heat treated and shot peened
Installed extractor includes black rubber insert with spring
Bolt Carrier is machined from 8620 steel and hardened
Gas Key Screws are properly torqued and staked
Bolt and Bolt Carrier feature a matte black nitride finish

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Alex Pro Bolt Carrier Group AR-10 308AR Nickel Boron

Alex Pro Nickel Boron Bolt Carrier Group AR308 308 AR DPMS Compatible

Alex Pro Bolt Carrier Group AR-10 308AR Nickel Boron DPMS Compatible

There was a time when 308AR/AR-10 bolt carriers were often in short supply. I remember some of us would send each other email messages if we found 308AR/AR-10 Bolt Carrier Groups before announcing them to 308AR.com forums. Today the 308AR/AR-10 Bolt Carrier Groups seem to be everywhere. Some from long time well known and well established firearm manufacturers and other from manufacturers I never heard. Todays entry is the latter. I happened across the “Alex Pro Bolt Carrier Group AR-10 308AR Nickel Boron DPMS Compatible” while browsing The Sportsmans Guide.

Note:The Sportsmans Guide seems to have a possible mix up between phosphate and nickel boron. Check the product titles and descriptions of the Bolt Carrier Group as well before ordering.

A quick internet search lead me to the “Alex Pro Firearms Armory”. If anyone has experience with Alex Pro send a message.

Bolt: 9310 material, Nickel Boron plated, Shot-peened, heat-treated
Carrier: SAE 8620, Nickel Boron plated, Heat-treated, Full-auto
Extractor: CNC-machined, Nickel Boron plated, Shot-peened, heat-treated
Firing Pin: Swiss-machined, Heat-treated, precision-ground,
Gas Key: CNC-machined, Nickel Boron plated, Heat-treated, Torqued and staked to Carrier mil.-spec
Cam Pin: Nickel Boron plated, Swiss-machined, Heat-treated

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Prime Weaponry 308AR Titanium Nitride Bolt Carrier Group

Prime Weaponry 308AR Titanium Nitride Bolt Carrier Group

If past history of 308AR and AR-10 parts shortage is a good indicator bolt carrier groups are one of the first parts to disappear in the supply chain. Enter this much welcomed Brownells exclusive – the Prime Weaponry 308AR Titanium Nitride Bolt Carrier Group, ready for installation. Titanium Nitride finish provides a unique look, while provide excellent lubricity, hardness and corrosion resistance. Carrier is made with 8620 hardened steel and the bolt is made from 9310 Vac-Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength. Gas Key is properly staked, and bolt is magnetic particle tested.

SPECS: Fits – DPMS pattern 308 rifles. Finish – Titanium Nitride.