surplus military rifle?

Need more info

Military model number often refer to the year the gun was adopted by that military

The only M1831 military rifles were flintlocks

That must be the serial number

A pic would be great

Does it have a bent bolt or straight?

How long is the overall gun?

Is there some type of hole in the butt stock?

Is the mag flush with the stock?

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Any of these even close

1) http://rangerdougs.com/yahoo_site_admin/assets/ima...

2)

http://www.mouseguns.com/arisaka.jpg

3)

http://www.restlessadventurer.net/guns/turkish_mau...

The third pic is of a Turkish Mauser but there are many many variants of Mauser

If your is a Turk it will have markings on the receiver in front of the bolt that look like a cresent

There should be some markings there anyway

There is another Milsurp with M31 in the name but it is a straight pull and has a large ring at the very rear of the bolt

The only thing about your description that fits the Mosin Nagant is the length

Bu a few Mausers were also that long

Some of your description does sound like a Mosin-Nagant. Check out this site, see if it has your gun:

http://www.world.guns.ru/rifle/rfl03-e.htm

It could also be another design.

And it can't say 1831. Are you sure? Because bolt action wasn't invented yet.

That third picture was a Mauser. Gewehr 98 fits the bill then. Everybody used Mausers, they were the best. So the design is German, but everybody used them. Its 8mm Mauser (7.92mm).

Sure it doesn't say "1891"?

Much of what you are describing sounds a bit like a Mosin-Nagant M1891/30. There are a lot of these old rifles floating around. (Of course the "1831" part probably disqualifies that...)

Sounds like a Turkish Mauser to me.

Go to surplusrifle.com and look at all the pictures till you find the same gun.