I just had an absolutely stunning sub gauge London best Hammer gun in that had passed nitro re-proof at some point in the past. The client asked me to measure them for him as he felt the were somewhere around .020" or so but he wanted to know what they really measured. Turns out he did not see the area of riveling a few inches behind one muzzle, the gun measured .013" for about 6" in length behind the choke on one tube. The client is now considering a sleeve job. The gun did come from a UK auction house.


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