Weapons used in COD5 servers
Total War, Resurrection, GangWar and LS CnREdit
These server use the default inbuild GTA SA weapons for fighting, deathmatch and etc.
Battlefield uses a special set of weapons in order to provide a good gameplay.
You can find custom vehicles with custom weapons attached, and weapon enhancements throughout the server. This enables the player's to use stuff such as dynamite, heatseekers, SAM sites, miniguns etc.
The armed vehicles can be viewed here - http://www.cod5samp.com/forum/index.php?topic=41526.0