OK great so you're an actor I'm going to hand you a colt dragoon, an m16 and sig p226 "these are your guns for the scene they're all fully loaded with blanks"
You tell me what checks your going to do to make sure they're safe for your scene?
None of this is dependent (in principle) on the type of firearm either (aside from the specifics of how you can apply the safety, ensure the weapon is safe etc..) and why would you have three different firearms in your possession at once?