"Silenced" AUG

XM-17E4 MSAR AUG with AAC SPR/M4 suppressor. The gun is fired in two modes, with the gas turned off (grenade launcher settings) in which the bolt must be manually reciprocated, and with the gas turned on, in whcih the gun acts as a normal semi-auto. Obviously, with the gas turned on, you get more noise from the bolt carrier reciprocating and the port noise. With the gas turned off, the gun was as quiet as a bolt gun. There is some sound reflection from the hillside surrounded the firing range, so the fidelity is not 100%.