Yeah, I'm just assuming it's a 2.5-inch chamber, and hoping I can maybe sorta translate or semi-understand a little of the proof marks once I inspect it. I'm no gunsmith, by any stretch, but I've learned through an expensive early lessons to always spend a lot of time looking guns over in the store when I go in to pick them up. Still rolling the dice, of course. But that's also kind of the fun. Until it isn't...