6315KM-S, 5.56mm is a short Key Micro muzzle device for Dead Air Silencers sound suppressors.  At 2.063" long, it's tiny compared to the 6315KM (2.4").  

Like 6315 on which it's based, 6315KM-S 5.56mm has asymmetric ports to optimize muzzle rise compensation without creating obnoxious concussion and noise, its 3 and 9 o'clock ports are slightly smaller and shorter, the design forces more gas to be vented through the 3 upward facing ports.

6315KM-S is a solid candidate for SBRs, and for users that want their carbines as short as possible.  Shortening the flash suppressor/compensator component of the muzzle hasn't unduly impacted its flash suppression and muzzle rise compensator performance.

Compatible with Dead Air Silencers Keymo and Key Micro 5.56mm sound suppressors.

Recommended torque: 25 ft lb +/- 5 ft lb.

Specifications:

• Length: 2.063". 6315KM-S can take a 14.5" barrel to over 16" with 0.1" of washers or shims.
• Weight: 3.53 o.z
• Material: 4140, heat treated and black nitrided.

Please NOTE:

• Do not use a crush washer if this is going to be a suppressor host.
• 6315KM has wrench flats for torquing it on the barrel.  Do not use a screwdriver and insert it into one of its ports to torque it.  With 30ft lbs of torque, using a rod or screw driver will cause damage to the muzzle device.
• Screw driver not included (but seriously, use a 3/4 wrench, armorer's wrench, or JMW, not a screw driver.)