In game there are currently quite a few squads wich sometimes have brief events where they return to the store, some examples include: type 99 long sniper, chauchat, Lewis gun, German bar, colt monitor and many more.
•i suggest these weapons be shown how battlepass weapons are shown:
Or be shown as “method of obtaining is classified” (shown here in a vehicle squad):
This would make deciding to buy these unavailable weapons easier, so when (or if) they return players could have already made up their mind.