[Ruy Dias de Bivar]

https://www.quora.com/Does-a-blank-round-cycle-the-weapon

“No. Weapons are cycled one way or another by the pressure built up by the expanding gas pushing behind a bullet. A blank round has no projectile, and so the gas is vented out the muzzle.”

[2harddrive]

“No. Weapons are cycled one way or another by the pressure built up by the expanding gas pushing behind a bullet. A blank round has no projectile, and so the gas is vented out the muzzle.”

He could have PLUGGED THE BARREL, or installed a blank-firing adapter, which works in a similar way.