Like Jim, I put away the flush ones - not that they aren't any good, but changing them is a PITA at times when you're ready to go on station. On my 1100 in 28 - the threads are a shallow square cut design - the only thing I have found that works on them is the teflon pipe tape.....I snug it down and it will stay put.
Remember, whatever chokes style you go with - they need to be removed and cleaned when you clean the gun - both the threads inside the barrel, the threads on the tubes and the inside of the tubes
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