bill i will have to find my info but theres a place in alascka that makes tubes from about 16 inches to any lenth you would want...i have a 22 magnum insert in the right side barrel of a 16 ga german drilling...it is only about 10 inches in lenth..it has adjustments to put the bulletto point of aim in the scope in it...so its possible some body should have 20 ga sleves with set srewsto put it to some point of regulation... if you dont find anything i will try to find info.... love this idea of yours.... charlie
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