Here's a few of the links I found after driftrider solved the puzzle, .. in the second link after opening it go down to the 3rd post by Jim Keenan
On the 5th link make sure you scroll to the top of the page to see a good pisture of a weapon .. maybe it will look a bit like your gun


http://www.ruag.co.uk/?p=8_4&t=Ammun...n%20Gun&menu=9

http://www.thefiringline.com/forums/...d.php?t=333999

http://www.rememuseum.org.uk/arms/stirling/index.htm

http://www.economicexpert.com/a/Rimfire.htm

http://forums.gunboards.com/showthread.php?p=467607