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hacksaw is drastic but if its a cheap old single barrel...why not....just take off very small amount at a time...be aware bakails barrels are smaller in diameter than others so your std choke guage...

or........ you could just do it yourself,its not rocket science or hard.we have done 4 or 5 over the years. if your shottie isnt tighter than modified it will be fine anyway and if its a Bakail it...