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. Mfg: Knights Armament SPECS: Material: Steel Caliber: 5.56mm Thread Size: 1/2"x28 Suppressor Compatibility: KAC QDSS-NT4 Rocksett Adhesive
