Heckler & Koch SL6
Country of origin



Heckler & Koch

Weapon type

Semi-Auto Rifle


5.56x45mm NATO


Roller-delayed blowback

Overall length

39.76 in (1010 mm)

Barrel length

17.71 in (450 mm)


8.36 pounds (3.6 kg) unloaded

Magazine/Cylinder capacity

3,4, or 10-round single column, internal magazine

Cyclic rate

Semi automatic, 2 round burst (SL6A2)

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.


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The H&K SL6 is no longer manufactured, having been replaced by the H&K SLB 2000.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.



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