hi i have inherited my grandfathers diana mod 22 air gun, id say it was in a worn condition but it is intact and working to the best it can, are these guns rare? i dont wish to sell it as i used it as a child (im 30 now!) i just wanted to know if there was anyone who knows what they are worth so i could insure it for the right amount etc - i did google the diana mod 22 but lots of other models showed up and not this one, the 22, i believe it takes the .17 shot does it? (i bought a tin of .22 and they are too big) stupid me