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I have an 1100 3 inch magnum barrel with one gas port. I want to enlarge the gas port to eject 2 3/4 inch shells for trap shooting. What size drill bit do I use to enlarge the gas port? Thanks for the help anyone can give me!
 

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The 1100 12ga 3" magnum barrel has one .0730" gas port (drill #48).

The 1100 12ga non-Magnum models have two .0790" ports (drill #47)

I do not have any specs or advice on how large to increase a single magnum hole to make it work with non-magnum loads.

Also note that these are ADVISED sizes. They may differ +/- from the factory.

Frankly, since a second hole should be drilled, and it's at an angle, I'd advise you to arrange to have a gunsmith do it, or sell the barrel and pick up a dedicated trap barrel.
 

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Personally, I'd get the right barrel to shoot trap loads. Drilling out gas ports could have some interesting consequences if the barrel ever gets used for magnum loads again.
 

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I shoot a 1100 and I agree with everyone else. Just buy a trap barrel. May be money well spent if you screw up the barrel you have know.
 

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Hate to diagree with anyone, but I have drilled the second gas hole on at least two 3 inch barrels to use light loads and have had no problems drilling the holes and the barrels cycled the lighter loads just fine. If you do not feel comfortable drilling it yourself, take to a good gunsmith and ask him to do it. I use a piece of wire in the first hole to determine the correct angle of the drill bit and then use a new very high quality bit and a good variable speed drill and take your time. The hole is close to an 1/8" drill so that was what I used. Worked out ok for me. Or you could find a 2 3/4" barrel and then you would be able to use the gun for two things. Trap and hunting. Lots of options. Thanks.
 

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I drilled a second hole with a #31 drill and tapped the hole with a 6-48 tap. That way I can put a plug screw in the new hole when using full power shells, and both holes open for light loads. HMB
 
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