I hope FBI is backtracking the serial numbers on these components and finding the diversions to Russia. Serialization similar to what the FDA mandates for drugs should be implemented by treaty for all NATO nations, and sanctions imposed on suppliers to Russia.
Before the 19th Century, black powder was so incompletely combustible that firearms, despite allowing a huge amount of windage (the difference between the diameters of the barrel and the ball), would become too fouled to load after as few as 4 shots. That's why smoothbores were used long after the rifle was invented. During battles, soldiers peed down the barrel and used their ramrods to clean them.