5.56/.223MUTA® II BM556TM1/2 X 28 thread pitchLength: 5.65 inchesMaterial: Inconel® 625Outer Diameter:OD at Flare: 1.815 inchesOD at Suppressor Body: 1.675 inchesWeight: 12.25ozFull-Auto Rated ALL NFA RULES APPLY. (All Sales Are Final On NFA Items, No Returns) dB(A) Bare Muzzle Bushmaster Suppressor Reduction Left Ear 170.3 145.3 25.0 Right Ear 163.3 137.2 26.1 Muzzle 162.3 137.3 25.0