In order to keep gas out of your face, especially when shooting suppressed, Lantac added some additional gas vent holes, some cut at an angle to blow gas forward during cycling. As with all other Lantac carriers, the 6mm ARC E-BCG features their domed head cam pin, designed to reduce wear both within the receiver itself as well as the cam-pin track in the carrier itself. The bolt is Carpenter 158 and magnetically particle inspected, like we’d expect from any quality manufacturer. Starting with a billet of 8629 steel, the carrier is machined then coated with nickel boron via the diamond NiB polish process for an extremely slick and slippery result. The heavier Lantac E-BCG for the 6mm ARC is the most advanced that they’ve produced to date. Lantac has never really made a “standard” bolt carrier group they’ve always incorporated at least some big upgrades from Stoner’s original design. In particular, we were told that 14.5 inches was phenomenal in terms of increased range compared to its 5.56 brethren.Īside from the caliber itself, the most innovative component here is Lantac’s enhanced bolt carrier. Once they hit the 15-inch mark, they began chopping off a half inch at a time. Because some companies actually do the R&D, Lantac started with an 18-inch barrel with an extremely short gas system, then cut off an inch at a time while tracking ballistic results and capabilities. Once they had their base design with Hornady supplying the ammunition, Lantac decided to invest a lot of research and development on the capabilities of shorter barrels with 6mm ARC. Hornady, PROOF, and E-Lander were also a large part of this project. In January of 2019, they were among a small, select group of companies handpicked to further develop the 6mm ARC and the rifle to go with it. They were part of a military research project looking for both a new rifle and corresponding intermediate caliber. T he folks at LANTAC first caught rumor of an exciting new round in development for the AR-15 back in 2018.
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