I used to be an airforce armourer, I really like the idea of maybe 1/10 or 1/12 scale weapons. I think 1/6 might be a little large, but 1/10th would be a good size for GBUs, Mavericks, sidewinders etc. something as big as a GBU 27 might be a pretty big kit in 1/6!
You could make a whole family of Mk 80 series bombs with all the various tail kits, guidance units, nose types etc.
As for small arms, I have a few of the dragon 1/6 scale action figures, these are basically very detailed 'action man', and the level of detail is good enough for this modeller, but 1/6 makes a pretty small M16. I have a MG42 that is a good size, complete with removable barrel and liftable feed cover. It comes with individually turned brass rounds in a non disintergrating link belt.
For small arms 1/3 might be better, but again, a .50 cal ould be getting pretty big. I seem to remember Verlinden did a few resin weapons in about 1/4 scale? They had an M16, an AK47, a lever action rifle and a revolver. I think they made a machine gun - an M1917 Browning .30cal. But these were not very big.
It would be nice to see something like this from somone, especially the aircraft weapons.