Ben Welter - Tuesday, September 19, 2017
U.S. patent application 20170261280 (applicant Sapphire Defense Group LLC, Easley, S.C.):
"Weapon barrels are disclosed which offer improved thermal performance and rigidity with no, minimal or negative weight increase. In general the barrel comprises a barrel core surrounded by a lightweight, thermally conductive sleeve made from metal-matrix composite (MMC) materials, also referred to as metal-matrix material. The increased diameter of the sleeve improves the barrel's stiffness and the sleeve's thermal conductivity and distributes the heat more evenly along the barrel. ... Hot spots may be reduced and more surface area can contribute to heat dissipation. The increased diameter also allows integration of phase changing and/or vibration dampening materials, which further enhance performance."