The muzzle on my H&K USP 9mm airsoft has a dimension identical to a 9mm slug. They strive for realism even down to the muzzle diameter. 1/2" or so inside the 9mm muzzle is the 6mm barrel for the actual pellet.
And for staged entertainment I believe that as long as the weapon is checked and checked and checked again... it is alright to break a rule or two. Especially if it's not even a "firearm".
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