I think the gun progression is in the right spot so far. I do think the AK47 seems immensely useless, except as an early gun if you got the bullets for it. By the time you can buy an AK47, you can buy a M16, and that's a far more precise gun. The only exception is if you fail to get EXALT operations but still have Cult Arms dealers and Red Dawn Operations.
MP5 is lovely, such a nice little balanced gun. I consider the L85 an upgrade of it.
There's a lot of interesting randomness to drops and such. Stuff like the Bolt-Action Rifle, SKS, QBU...
I have been using a FAL I got from some mooks in big missions. Sweet gun, but feels underpowered? Brazilian army was using FALs until 2000s something, and I know ex-military people. It should be quite stronger than M16.
(the current brazilian rifle is just a plastic NotAFal chambering 5,56mm loool)
I thought Uzis were useless and couldn't hit shit, but I just realized uzi snap shots fire 3x. Now I'm going to spray the fuck out of people with the Black Ops SMG until I no longer feel as if I missed out.
Looking at all the guns, sometimes I feel like I got too many guns, not enough people to carry them in every mission lol. I generally go with a Sniper/Rifle/Shotgun/Greenadier-Pistoleer load-out, add different rifleman and/or submachinegunner if using Hummer or Copter.