There isn't a lot out there in that time period, I'll be honest. The only other weapons in the game you could have are M14s, M16s, AKs, SKS's, and maybe the AutoGyro as a sniper rifle, but really, A lot of the ground has been covered before.
I get there's also an argument about "Well, they are just black Ops and they get all the new stuff faster", which has it's merits, but is also 100% wrong.
As for losing respect for Treyarch as a publisher, that's going a little far. Frankly you have to come to terms with the fact that historical authenticity is not a priority for these games.
The Call of Duty games aren't the games looking for authenticity, they are looking for entertainment. Let us not forget the ISS was farther than the most powerful nuclear weapon in the world away, but still somehow got destroyed in MW2 to go with that also that America was somehow 100% dependent upon satellite radar systems that no one thought "Huh, SOSUS is picking up a massive armada of Russian ships, and older radar stations across the globe are reporting multiple air armadas, oh well, no biggie".
It's the entertainment in the game, and watching it happen, rather than sticking with reality.