There are many types of finish. Your local library should have books on furniture/woodworking, etc..
Can't be answered without knowing who made it and the serial number. don't refinish it.
Linseed Oil
http://www.outdoorlife.com/outdoor/diy/article/0,19912,658527,00.html
the stock is what you use to hold the weapon by.
the tf11 only comes with a stock or it doesnt. you can not buy an extra stock for the gun.
About half or 2/3rds. But some people like their guns to look good, so if you plan to keep it... shoot it, refinish doesn't affect operation.
---- == ==
use a saw and chop the stock, then refinish and attach buttplate.
yes just sand it and cover it with clear coat
Try gun shops, gun shows, want ads, e-gunparts.com
Mainly in the stock
Estate sale, garage sale, gun shop, pawn shop, gun show, stock shop