The ex Scottish Aviation Bulldog 124 demonstrator based at Prestwick Flying Club used to be fitted with guns and rockets. It has hardpoints on the wings, and still retains its weapons panel and stick-mounted trigger. I wouldn't call it a warbird, though.
Have any of you seen the film footage of the rocket-armed MFI 9Bs flown during the Biafran crisis? Any of you who have flown its derivative, the Bolkow Junior (see February's Pilot Magazine), will agree with me that it definitely isn't a warbird!
http://www.brushfirewars.org/aircraf..._biafran_1.htm