The co² revolver I have is definitely zinc. Eventually I'd like to practice engraving on some of my crummier pieces in my sword collection to see what hardened steel carves like. I do blacksmithing on the side so I also have a lot of differentially tempered hammers I can engrave as well.
I'm going to take a look at those powergravers. I imagine they're much nicer for carpel tunnel sufferers. We're trying to get the house renovated so we can rent it out though. Might have to stick to hammer and chisel until I have a bit more money.
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