Remington now imports the Baikal shotguns under their 'Spartan' brand. Barrels for the "Remington" Spartan SPR-453 are the same as your Baikal.
No, not yet
499$
yes
2001 - the first 2 digits are the year of manufacture.
You can obtain the owner's manual for the Baikal MP153 shotgun from several sources. The official website of Baikal or its parent company, Izhevsk Mechanical Plant, may provide downloadable manuals. Additionally, firearms forums, gun shops, or online retailers that sell Baikal products might have the manual available. Lastly, contacting customer service directly can also help you acquire a copy.
See page 18 of the manual, available at the following link. http://www.eaacorp.com/Manuals/mp153.PDF
Yes, some of the remington tubes will but not all. I have a remington modified choke in my mp 153 right now.
nowhere
On the Baikal/Remington SPR 310 O/U, you simply push the trigger forward to select the top barrel, leave it alone to have the bottom barrel fire first.
18.4
Parts for these shotguns are hard to find. EAA Corp carries parts for Baikal shotguns. A good gunsmith might also be able to help make some parts.
Cleaning instructions start on page 20 of the owners manual which is available at the following link. http://www.eaacorp.com/Manuals/mp153.PDF