Very good idea. IMO every item should be at least tradeable (if not producible), that includes not only bazookas and parts thereof but also:
- energy bars
- bazooka boosters
- damage boosters
- Guerrilla Fight gear
Of course in case of bazooka parts, they drop in varying quantities. Market prices would reflect these differences, ie. the price of scopes would be considerably higher than the price of trigger kits but there would always be somebody willing to buy even the most common parts.
Adding more markets doesn't seem to need much programming effort as opposed to creating new game modules/making big changes and it would nicely make eRepublik a more interesting game, with more options, more strategies, more ways to enjoy playing it.