It's not the prices on the actual Russian rifles. It's the cost of the current options that will react. If Ishmash rifles are back on the market Arsenals Bulgarians (which are amazing) immediately reduce value. Zastava rifles (which kick a$$) will have no other choice but to reduce mark up.
The production volume that the Russian factories are still capable of is unimaginable. The simple lifting of sanctions will end American attempts and lower prices immediately.
I cant see Arsenal rifles reacting to more Saigas coming into the market unless they import the models with the front ends properly converted. Zastava rifles are not really that over priced at this time. I can see more options and the new Arsenal rifles helping to drive down prices $50-100 on certain AKs in the near future. There is more demand overall on AKs and imports still set the standard so prices wont drop out the bottom like the over saturated domestic AR market.