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The Heckler & Koch SL8 is a semi-automatic sniper rifle manufactured by Heckler & Koch. It is the civilian version of the Heckler & Koch G36.
A semi-automatic rifle, gas-operated bolt with rotary bolt head using 7.62×37mm (.300 Whisper - a subsonic round made by necking up the .221 Remington Fireball case to .308" and using a 240 gr Sierra MatchKing bullet). The cartridge will fit and feed from all standard 5.56×45mm NATO magazines. The Whisper has effectively the same power and weight as a standard .45 ACP, but the lower caliber greatly increases armor penetration. The SL9SD uses 10- and 30-round magazines, is 1.15 m length, 27 cm height, 5.8 cm width and weighs 4.6 kg (with suppressor).