Hi OMN
Yeah i built some Bolt Action soviets with Victoria Miniatures laser rifle arms a while ago, figured i'd use them to represent conscripts/whiteshields as they're on the non heroic scale of things!
But i have some Anvil phase carbine arms that i've cobbled together to a spare
BA body for you
They don't look half bad
TBH! Of course the hands are rather over sized... Though the Anvil arms might look better on your winter dress soviets i'd say as i assume there's more bulk to those models.
Mad Robot's federal service rifle is a nice alternative lasgun for
BA scale as its really quite a slim weapon
Apologies for the crappy pics but i hope that helps!