Only plausible and distant chance for more Combloc surplus is if we got more friendly with Cuba and they unloaded some of their junk on us for a cash infusion on their end. Who knows what kind of junk they have? Antique Spanish Mausers, M1's, M1 Carbines, maybe Mosins and SKS. Maybe ammo in spam cans. Anything newer than that is not importable unless they're parts kits.
It would be cool if it happened.