Should we have the right to bear arms during a speech?

Yesterday's news that someone had interrupted a Bulgarian politician's speech by mounting the stage and pointing a gun at him made me realise how little I know about Bulgarian politics - as well as how unusual (thankfully) it is for audiences to respond to speeches in this particular way.

I also realised that I have no idea as to whether or not the Bulgarian constitution enshrines the right of its citizens "to bear arms", or indeed to beat up anyone whose gun fails to go off at point blank range.

Needless to say, I hope that neither of these rights is enjoyed by Bulgarians, and, more importantly, that such trends do not catch on in the USA...