Go to site listed below you can download the manual for free. http://www.remington.com/library/downloads/owners_manuals.asp
What Model 51 pistol or a rifle and what model?
You have to hit it with a slede hammer until it breaks down then you've done it
If you do not have a manual, you need to visit a gunsmith.
Go to Remington.com and request a manaual.
Did you a mean Remington SPR220? Remington SPR220 is a side-by-side shotgun. You can get a schematic of this fine shotgun from down loading the owners manual from Remington. Kathleen
Yes, they are directly available from Remington Arms. If you contact them via their web-site Remington will send you one. The RH or LH basically requires the same type of maintenance.
Go to Remington's web site and you can request a manual for free.
Go to Remington's website and and you can download one or have one mailed to you.
Burn it!
DON'T!!! unless you absolutely have to. you can cause damage if you don't know what you are doing. and parts are hard to find.
The sears model 200 is a Winchester 1200. That will make it easier to find info. I have one of these, with adjustable choke and vent rib. It is a sweet shooting and smooth little shotgun.
They only way to do it it is to comb through all the serial numbers of all the different types of shoutguns Remington has made the past 150 or so years. Remington.com has a history section in its Sportsman's Library that you might be able to use to narrow it down.