Freedom 5.56 M855 62gr AP New (Free Shipping! Orders $249-$2000)

The 5.56×45mm NATO standard SS109/M855 cartridge was designed for maximum performance when fired from a 20in long barrel, as was the original 5.56 mm M193 cartridge. Experiments with longer length barrels up to 24in resulted in no improvement or a decrease in muzzle velocities for the SS109/M855 cartridge. Shorter barrels produce a greater flash and noise signature.