As far as I know, Baikal chokes aren't interchangeable with other guns (the way invector, winchoke, accuchoke are for example). Here are some links to Baikal compatible chokes if you're looking to buy some.
http://www.trulockchokes.com/get-cho...kes=See+Chokes
http://www.choketube.com/choke-tube-...oke-Tubes&mf=2