I've seen adjustable gas ports for M-1 rifles, and I thought I saw one for 1100s, too. If available for the 20-ga, oversize the port, get an adjuster and you'll be able shoot anything.
Edit: I used the wrong term, it's not the port that's adjustable, but the gas plug.
Last edited by zippy13; March 24, 2012 at 01:32 PM.
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