Parts and accessories for use with rifles, automatic rifles, and semiautomatic rifles, namely, rifle barrels of all sizes, barrel twists of all sizes, hand guards, flash hiders, gas blocks for attachment to barrels, collapsible firearms sights, back-up firearm sights, bolt carrier assemblies, charging handles for machine guns, dust covers for firearms, forward assists, kits for making the lower part of a rifle, lower receivers, buttstocks, recoil buffers, trigger mechanism, bags specially ada...