The OTs-14 "Groza"
Please it would be really cool to add, we need more actual good games to include it, plus theres like 2 variants you can add, either the 7.62 one (OTs-14-1A) or the 9x39 one (OTs-14-4A) both have a grenade launcher variant which is almost never implemented anywhere. The ASh-12 or RSh-12 would be cool too though.