[Daviey]

Pistols can use blanks quite happily, both revolvers and the semi-automatic pistol used by most as they use recoil.

I think the issue being raised here is rifles that make use of the pressurised gas produced by the bullet leaving the rifle... as there is nothing to retain the pressure it will not load the next.. Which is why they have 'Blank Firing Adapters' to create the pressure: https://en.wikipedia.org/wiki/Blank-firing_adaptor