I have oem clear 10rd mags. Tactical solutions used to sell bases for them that are spring loaded and pressed against the magwell when inserted. I have two and love them. Wish i had bought more. May be able to still find them on eBay or somewhere.
I really hope it catches on and the aftermarket puts out stocks and doo-dads for it. It's a little fugly as is. Bet a ruger integral suppressor like the one for the 10/22 is in the works.