Weapons are more my thing, weapons classes are not per say though I guess that might be an oxymoron. Though I understand what you want, my ref A (Just the way I get when tired.) from my post did answer the weapon issue. I'll take it further from that with the below with pics.
1. Basic
STYRKER all were from the beginning equipped with the PROTECTOR RWS using either the 50 cal. or 40mm GL.
http://www.military-today.com/apc/stryker.htm
2.
M1128 MGS has a 105mm with a turret mounted 50 cal. and 7.62mm gun. The pic shows the 50 cal. clearly.
http://www.military-today.com/artillery/stryker_mgs.htm
3.
M1129 MORTAR Carrier has a roof mounted 7.62mm.
http://www.military-today.com/artill...ker_mortar.htm
4.
M1134 ATM TOW has a 7.62mm mounted by the commanders hatch. The USMC and USA versions will be around longer then the game allows for currently. Both are testing with newer weapons systems to include the ITAS TOW. That'll be an issue for next year.
http://www.military-today.com/missil...34_stryker.htm
So it would appear something might be amiss without doing an OOB check.
Regards,
Pat