Freedom 5.56 M855 62gr AP New (FM556MA62N50)  

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.

*Some discoloration may have occurred in these cases. Winchester WMA headstamped cases were purchased primed, new and unfired. They were factory sealed with a waterproofing lacquer in the case mouth and primer pocket. The discoloration is due to the annealing and added sealant, which we cannot remove from primed cases. Extensive testing has been done to ensure they are the same quality as any other case we use. A standard solvent is all that is needed to clean your firearm after use, and the cleaning process is the same for these as other unsealed cases.