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LAX factory new 5.56 M855, loaded with a 62 grain projectile. Proudly made in the USA. 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.
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