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Look at these pages for general info. The B-45A had 2x.50cal M.3 guns, the B-45C had 2x.50cal M.7 guns, and the RB-45C had 2x.50cal M.7 guns. On the RB-45C, sometimes the position of gunner was removed but the guns remained and were controlled by the pilot via toggle switch and were set on the ground to fire either 45 degrees up or 45 degrees down.

http://home.att.net/~jbaugher2/b45_2.html
http://home.att.net/~jbaugher2/b45_4.html
http://home.att.net/~jbaugher2/b45_5.html
http://home.att.net/~jbaugher2/b45_6.html