Anything with a 24" bar or larger in the presence of the uninitiated. Cries of "Wow, look at that" can be heard.
Not as bad as going to a public gun range and uncrating an Armalite M14-A4(T) with all the fixin's.
Yes, I imagine it would - but only because there is no such rifle.
There is an M15-A4(T), however. I'm sure that's what you meant. Right?