This is a borescope shot of my most recent Mcgowen barrel, it has some really odd markings all the way around the barrel on the lands. Perhaps it was rebored? It seems to shoot OK, But I've only had 50 rounds of load development down the tube so far, so I can't comfortably make a statement about accuracy.
The "GO" gauge also wouldn't close on it from the factory. I can chamber ammo, but not the go-gauge. Same as with my first mcgowen barrel.
They are priced competitively, so you get what you pay for.
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