Warren Ellis made it work in the context of the Ultimates universe. The movies were clearly influenced by this depiction, since I don't know any other versions of Sam that use submachine guns.
Ellis also gave Sam a scientific pedigree, which was cool.
Also, winged characters using firearms is classic Marvel.
I always thought the guns were a bit much, but I digress...
Reminds me of Avengers Assemble Sam being into engineering.
Probably, although not sure how much he'll get to do in the suit now. Unless the next Cap book is a new solo for him.