Lewis Machine & Tool Company's MRP and CQB MRP barrel in 6.8 caliber provides an option for those already carrying an MRP in 5.56 caliber because it is more accurate at longer distances and has greater hitting impact than the 5.56 caliber. No armorer or gunsmith services are required -- the operator can quickly install the 6.8 barrel, bolt and magazine while in the field with only the supplied installation wrench.
