Welcome to HC. You made a great buy..3 bucks for a K3!! wow..For all my intermediate shooting that is my all time favorite scope...especially if it has a post crosshair of one with a dot. Hope you like it.
Now..as for my weekend at the gun show..sold a lot and bought a lot. My best buy in my opinion was a Leupold VariX III 2 1/2x8 scope(with dot crosshair) in exc condition for a hundred bucks..I was flabbergasted when the guy told me the price. On a down side though I sold one of my Weaver K-6 scopes..with a post..I still have one with a dot. On a very bright side I found a Smith and Wesson 657 41 mag....4 inch(darn) in really good condition for 550 bucks. I am now a happy camper. I can finally shoot some of that 41 mag ammo I got a few years ago. I did get a new set of RCBS dies with it too...but I had to buy a Colt Diamondback 22 6 inch from the same guy..package deal..Paid the same for it. Not a big fan of Colts but think it was a good deal. Got lots of littles...even got a Bair Big C press for 20 bucks..like I needed it. Hard to beat those old American iron presses