See here. The language essentially freezes all assets of certain Russian persons that are held within the jurisdiction of the United States, including persons “to operate in the arms or related materiel sector in the Russian Federation.” It also prevents them from entering the country. I’m not certain whether this would affect firearm and ammunition imports, but my reading of it suggests that it does. I am not familiar enough with the International Emergency Economic Powers Act to know for sure. It would seem that ammunition within the country already is fine, because it’s your property, or the property of the ammo dealer. Whether Wolf, which is a domestic corporation, is affected, I do not know. It would seem it would depend on whether any Russian Oligarchs own it. But either way, my reading of this suggests that it would be unlawful for anyone to purchase ammunition from Tula, which Wolf needs to do to stay in business.
Stay tuned.
UPDATE: Politico suggests that no, it only targets personal assets.
American officials stressed Monday morning that they were going after only the private finances of the people targeted, and not their business interests, with the hope that this strategy — done in coordination with travel restrictions and parallel moves by European Union member countries — will increase pressure on Putin.
Though, the EO reads differently.