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

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.

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.

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

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

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

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.

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

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

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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BUILD an ARMALITE AR-10 | How do I Build an AR10 Online? | AR308

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.


308AR AR-10 Primary Build kit

JP ENHANCED EXTRACTOR JPEB-308EX 308 AR

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX – This replacement extractor for DPMS 308AR AR308 pattern .308 bolt assemblies includes our extractor spring/rubber core. JP 308 AR ENHANCED EXTRACTOR JPEB-308EX provides a great upgrade over existing over factory 308 AR extractors.  JP completely redesigned the extractor, using improved materials and heat treatment processes.  This extractor will hold up for thousands of rounds, instead of encountering extraction issues after a few hundred.  Fits DPMS pattern 308 bolts.  Includes extractor and spring.

JP 308 AR ENHANCED EXTRACTOR

JP 308 AR ENHANCED EXTRACTOR

Installation Instructions
Engineered to provide a much longer service life than standard extractors, the JP .308 Enhanced Extractor is an easily swappable component for any DPMS pattern bolt to eliminate extraction problems, premature extractor failure and other malfunctions resulting from the extractor not clearing the case rim. While designed to remedy these extractor‐specific problems, the JP Enhanced Extractor will not solve issues stemming from poor chambering or over‐gassing. If your rifle continues to experience extraction issues with this component installed, the problem lies elsewhere. Refer to the section below regarding such failures.
To remove your existing extractor, use an appropriately sized punch to drive out the extractor pin. On all current JP EnhancedBolts, this pin can be inserted/removed in only one direction. With the pin out, the extractor will then be easily removable and should retain the extractor spring, which need not be removed from the extractor. Install the JP Enhanced Extractor in the same manner making sure that the extractor spring with rubber insert and the O‐ring remain in assembly.

ADDITIONAL EXTRACTION ISSUES
Although much development, thought and testing have been put into optimizing the performance and durability of this extractor, it is important to know that other factors enter into an extraction failure and some of these are beyond the ability of any extractor to overcome. If you have a rifle that has extraction issues, it is important to find and address the root causes that may not be related to design deficiencies of the extractor itself.

Note that if you see the rim of fired cases slightly bent to the rear from extraction, this is an indication that your rifle is on the verge of not extracting or breaking the rim off the case. These cases should then be discarded and not reloaded. The cause of this should then be determined and addressed.

  1. Over‐pressured ammunition causes the case to extrude into every minor imperfection in
    the walls of the chamber. The case will then stick and fail to release from the chamber during
    the firing process. For reliable extraction, the case must relax and release the chamber
    during the firing cycle.
  2. Port pressure that is too high or too sudden will cause the extractor to break the rim off the
    case before it has a chance to release the chamber. Excessive port pressure causes too rapid
    a pressurization of the bolt/carrier assembly, which in turn attempts to extract the case too
    quickly before it is “ready” to come out. If the port is close to the chamber as in the carbine
    port position, this exacerbates the problem further. An adjustable gas system can usually
    solve this issue.
  3. Micro flaws in the chamber of any self‐loading rifle are an invitation for a malfunction. If the
    chamber has reamer marks, scratches from sand or grit, rust pits or any negative features
    into which brass from the casing can extrude during the firing process, this will literally lock
    the case in the chamber and defeat the best of extractors. If these anomalies are not overly
    severe, the chamber may be recoverable with a good polish. Rust pits, however, usually
    spell the end of a good barrel. A ring depression from a bad or fouled reamer is also not
    recoverable, and the upper will have to be re‐barreled.

 

JP 308 AR ENHANCED EXTRACTOR JPEB-308EX


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