I've had the barrels so hot on Argentina dove shoots you couldn't touch them. One of the more experienced guys on my first time down there wore a welder's glove on his forearm hand. I wounded a parakeet that landed in a nearby tree & my bird boy wanted me to finish him off, the gun was so hot that when I tried to sight down the barrels to aim at the bird, the heat mirage coming off the barrels was so bad that I couldn't see the bird. In all of the two-barreled guns I've seen on my eight trips down there, I've never seen a rib separation and several of those guns had been on multiple trips & survived without a hitch.
The only time I've experienced melted/welded plastic in a bore other than on my buddy's gun the other day was in screw chokes on Argentine dove shoots, the only way I could remove the plastic was to carve it out with a pocketknife. On that particular hunt the shooting was so fast & furious I had to clean the choke tubes at lunch & then again after the evening shoot.
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