Hopefully the drought of rifle arms can be sorted out by mixing in arms from other sets. However from the WWI German set I have from Wargames Atlantic - they don't seem to scale well with other manufacturer's plastic kits.
These figures have arms that are quite chunky. At best they'd work with Warlord's range - if you work on covering up the joins. I'd bought the Wargames Atlantic figures hoping they'd work with my Perry stuff (based on all the folk saying how small these models were supposed to be). However they're well on the Heroic scale if anyone's curious.
Great Escape Games recently showed off a plastic Wild West gunslinger set that could maybe be mixed in with these figures for variety too - if you say buy single sprues from Ebay.
Wargames Atlantic's said that they have more WWII sets coming. We'll have to see how they handle their second Partisan set. Particularly if its more male figures - so the parts can be interchanged - or if its a female set. It may wind up being that their sets exist in their own ecosystem as far as parts interchanging goes due to their weird proportions.