As a smart traitor I'm not going to risk outing myself by adopting "new" weapons that are worse than those already in service. Rather I'll stick with what the army already has which is fine but rather long in the tooth by the 1930s (and more importantly not adopt any LMG to supplement them).I really think the Colt Potato Digger is highly overrated...^1
^1 The damn thing worked very well, STRD. It just "looked peculiar". If the Marlin mod had gone through, as planned, it would have been one of the three best aircraft machine guns of WWI.
As for "excellent pistols", I nominate the Nambu Type 94 automatic pistol in 8 mm, or the Glisenti Model 1910 and/or the Mars pistol. Those three pistols are just fantastic, much better than the Nagant revolver.
And how about the Ross Rifle?