The KAC M4QD Flash Hider is an effective flash suppressor that also serves as a platform for attaching a Knight’s Armament quick detach QDSS-NT4 sound suppressor. Comes complete with a 7-piece shim kit.
 
Specifications:
Weight: 2.4oz (68g)
Length: 1.875″ (47.625mm)
Thread Size: 1/2″ x 28
Suppressor Compatibility: KAC QDSS-NT4