Heckler & Koch SL6
|Heckler & Koch SL6|
|Place of origin||Germany|
|Manufacturer||Heckler & Koch|
|Produced||1980s - 1991|
|Weight||7.92 pounds (3.6 kg) unloaded|
|Length||39.76 in. (1010mm)|
|Barrel length||17.71 in. (450mm)|
|Cartridge||.223 Remington, 5.56×45mm NATO|
|Rate of fire||Semi-automatic or Select-fire (Semi, 2-round Burst) (SL6A2)|
|Feed system||3, 4, or 10-round single column, internal magazine|
|Sights||Rotary rear aperture drum, hooded foresight|
The Heckler & Koch SL6 is a roller-delayed blowback operated sporting carbine made by Heckler & Koch. It is manufactured in 5.56×45mm caliber. The design was originally based on the HK 630 sporting rifle and is essentially a shorter-barreled version of that rifle. It was marketed throughout the world as a hunting/utility rifle.
Design and operation
The roller-delayed blowback action is similar to that used in the G3 battle rifle and is the hallmark feature of Heckler and Koch's pre-G36 line of small arms. The four groove barrel features polygonal rifling with a right-hand twist of 1 in 10.6 inches. The chamber is fluted with 12 longitudinal flutes extending rearward from the baffle to the chamber face. These flutes permit propellant gases to flow around the case acting as a lubricant to ease extraction. The SL6 has a diopter sighting system and utilizes Heckler and Koch's proprietary HK 05 claw-type scope mount. Two rectangular recesses have been cut into the upper receiver to accept this mount.
The H&K SL6 is no longer manufactured, having been replaced by the H&K SLB 2000. The H&K SL7 is a variant chambered in 7.62×51mm caliber. The H&K SL6A2 variant is essentially the same rifle; however, the SL6A2 includes a flash hider and offers a two round burst selector.