A198-A and A198-B are like brother that born together. But grow apart. The main concept design of both is gun receiver that can be universally customize to fit the need of the cilent. since both gun basically share alot of similarity and disign with customizable in mind. make it cheep to make many variance of it on the base receiver. It even can be modify on field if needed. But A198s and not design to do every role. The universal receiver is just to make production simpler. A198s are not expect to be modify to do other role after left the factory.

The main different of A and B variance is just A (short from Assault) use intermediate cartridge (5.56 NATO) and B (short from Battle) use full power cartridge (7.62 NATO). there also testbase of C variance (short from Combat) which use subsonic cartridge (.300 blackout and 7.62x39mm) But .300 blackout version never materialize and only one 7.62x39mm version are produce.

there is 4 configuration for both A and B variance.
	- Standard rifle MOD.0 : The standard configuration. nothing fancy.
	- Modification MOD.1 (DMR) : Equip with longer and more precise cut barrel and bipod as after sales service.
	- Modification MOD.2 (CQB) : Equip with shorter barrel and integrated silencer.
	- Modification MOD.3 (LMG) : Equip with heavier barrel, belt-fed lock on side of the gun to load belt ammo, and change firing control group to be open-bolt configuration. Also, equip with integrated heavy bipod. Still able to use the magazine like standard rifle.

Both A and B variance are been used in ArmataSF. Units as Standard equipment. But A variance are prefere by elite squad and vehicle personal with mostly being MOD.2. While B variance are mostly being MOD.1 or MOD.3 equiped in standard squad.