You have one of the finest 22 rifles ever built. It is a 1906 Winchester. A smaller version of Winchesters model 1890. Made of milled steel and walnut by skilled craftsmen. No plastic, or pot metal. No casting and no stamped tin parts. As good as it gets. I sure hope you were kidding about it being a project rifle. It need nothing. Just because the bluing or nickle isn't as it left the factory does not mean it needs anything. This gun has survived for over 100 years without any ham handed neophyte "refreshing" it. Few guns these days will ever have the character that your rifle does. There is true beauty in well worn tools. Re-blue it and refinish the stock and all that character is lost FOREVER. Any refreshing will remove money from your wallet and devalue the gun by half. If you just need something shiny, save the money you were going to spend refreshing this rifle and just buy a new rifle. Few older guns have been left original as yours is, please leave it as found. The large screw on the side is a takedown screw.