16 gauge help

[6pt-Sika]

I’ve got a 16 gauge 0 grade top lever 30” gun that I shoot pretty well . Had it down at Old Forge last year and it doubled on me a couple times 3/4 of the way thru . I had a good round going until it doubled and it got in my head so the last 25 were not up to the first 75 . When I got in to the shop the next day the locks came off the file came out and the doubling was cured . I think six strokes on each lock and it was cured , never doubled since knock on wood .

[bob lyons]

Thanks
Yes I tried shooting the left barrel first and it did not double.
The previous owner had taken it apart and cleaned the locks.
Sounds like an easy fix for a competent gunsmith.