Heckler & Koch SL6
| Heckler & Koch SL6 | |
|---|---|
 | |
| Type | Semi-automatic rifle |
| Place of origin |  Germany |
| Production history | |
| Manufacturer | Heckler & Koch |
| Produced | 1980's - Present |
| Variants | SL6A2, SL7 |
| Specifications | |
| Mass | 7.92 pounds (3.6 kg) unloaded |
| Length | 39.76 in. (1010mm) |
| Barrel length | 17.71 in. (450mm) |
| Cartridge | .223 Remington, 5.56x45mm NATO |
| Action | Roller-delayed blowback |
| Rate of fire | Semi-automatic |
| Feed system | 3,4, or 10-round single column, internal magazine |
| Sights | Rotary rear aperture drum, hooded foresight |
The HK SL6 is a roller-delayed blowback operated sporting rifle made by Heckler & Koch. It is manufactured in 5.56x45mm caliber. The design was originally based off of the HK630 sporting rifle and is essentially a carbine length version of that rifle. It was intended for and marketed throughout the world as a hunting/utility rifle.[1]
The roller-delayed blowback action is similar to that used in the HK G3 battle rifle and is the hallmark feature of Heckler and Koch's entire line of small arms. The four groove barrel features the 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. There are two rectangular recesses have been cut into the upper receiver to accept this mount.
The SL6 is no longer manufactured having been replaced by the HK SLB 2000. The HK SL7 is a variant 7.62x51mm caliber.[2] The variant, SL6A2, is essentially the same rifle however, the SL6A2 includes a flash hider and offers a two round burst selector.