Lantac Full Mass Full Auto NiB Coated Enhanced Bolt Carrier Group (E-BCG Heavy) For .308 / 7.62 x 51MM Rifles


In Stock

Item ID: LA00300

Lantac Full Mass Full Auto NiB Coated Enhanced Bolt Carrier Group (E-BCG Heavy) For .308 / 7.62 x 51MM Rifles


In Stock

The Lantac Enhanced Bolt Carrier Group is a full mass (18.1 oz) AR10 full auto bolt for increased mass, increased lock time and smoother operation. It is precision machined from 8620 steel with a precision hard ground and magnetically particle inspected bolt manufactured from 9310 steel. The entire carrier assembly is NiB, Electroless Nickel Boron coated with the patented, advanced UTC EXO process, unlike standard NiB coatings. This offers extreme lubricity with a friction coefficent of .02 and surface hardness of 82-85 Rockwell C.

The carrier's patent pending design features unique shrouded and forward facing gas ports that have also been re-sized so that gas is vented differently than a standard carrier. This results in a system that runs flatter with a smoother energy pulse. 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 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 and the bore of the carrier and gas key have been hard chrome lined for the best possible wear resistance.
Gas keys are properly staked at four points and only grade 8 fasteners are used in assembly.

All Lantac E-BCG's feature the 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 and rounded head reduces wear within the upper receiver.

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 18.1 oz
  • Forward porting, enlarged vents
  • Balanced flared boss
  • 8620 carrier, heat treated, hard turned, chrome lined
  • MPI 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
  • Lifetime warranty

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Made in USA
Made in USA
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Customer Reviews

Used bolt?


Haven't used it yet. It arrived in a timely manner. On inspection, I found that the carrier looked brand new as expected. When inspecting the bolt however, it looks like it's been used but cleaned well enough to remove any brass coloration. The rear of the bolt where the rings are have two small nicks on it. I'm not sure if this is normal but I doubt it. I do have pictures. The inside of the carrier where the bolt sits isn't showing any damage. Hopefully all this is my inexperience as far as inspecting a $300+ BCG, but for the price I expected it to be spotless. Will update review and rating if/when I get answers.

Reviewed by: Wes from USA on 3/17/2017

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