ok. i was looking around in the mw2 files and i found something i never thought to have seen. the r700, m40a3 are in!!! well their in the game but we just cant use them. also i found a "white colt" that looks like the colt from cod waw except its white.
sorry i cant give screen shots right now BUT go into your "Call of Duty Modern Warfare 2\main" folder and open up the iw_03.iwd (use winrar to open it) and look for "mtl_weapon_m40a3_col.iwi" or something along those lines.
if you look there are also some other things in there too!