b'A2S-QD*Hammer Comp mount includedLENGTH.7.0 DB SPL139.1dB @r-ear, 133.4dB@l-ear, 133.2dB @muzzleWEIGHT.19.4oz MATERIAL.H900 & Nitrided 17-4SSDIAMETER1.5 MSRP$979CALIBER5.56mm RATED FOR.Full Auto for 5.56mm down to 7.5'