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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.
|Bullet Profile||Full Metal Jacket (FMJ)|
|Bullet Weight||62 Gr|
|Velocity AVG||3020 FPS|