I don't know what caused it, but I've seen the same thing happen twice, both while trap shooting. One was a Remington 870 TC in Southern Maryland, and the other was to the bottom barrel of my friend's Diana Grade Superposed while trap shooting at Coeur d'Alene, Idaho. Larry sent the 870 to Ilion and Remington sent it back with a new barrel, but no comment on what caused it. About a three year turn around time from when Alan sent his Diana to Browning to when he got it back with new barrels, and again no comment on what caused it.
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