I know this thread is old, but I was catching up on my reading and stumbled across it. I was interested to see the post about a shotgun that had been regulated for slugs by removing metal from the insides of the muzzles. Having a double shotgun that will shoot slugs from both barrels in a reasonable group is something that has interested me, and from my reading a lot of others, for a long time. What I am curious about is has anyone else ever tried the method referred to, and if so and it worked, then why couldnt one do the same operation on a choke tube? I am perplexed as to how working on the inside of the muzzles can move the impact enough to matter, without removing a lot of metal, but this thread isnt the first time I have ran across this idea. If it can actually work I am seriously getting an inexpensive double and trying it. I would love to hear any ideas or experiences with this project. Thanks in advance.