Belt_Fed's shrouds require threading if your gun doesn't haven't it done already from S&W, But he does that also. Im pretty sure on that, But he can do so many things its possible he can make them and not require that now.
Whats bad is the 15/22 is still relatively new to the market and companies are just now tooling up for after market stuff exclusively for the 15/22 as most any AR accessory will work also.
Its been said before, But the 15/22 is a Barbie for men.
Dress it up like you want, Draw on it with Crayons, We don't care and do.
Most people here have guns with accessories that cost more and sometimes many times more than what the gun cost.
I cant wait until the make a .223 conversion so the AR guys get jealous. Id prefer .308, But hey there has to be limits to everything!