I wont add anything to the dimensions topic because not much can be said based on the two basic numbers you provided.
If the barrels need to be replaced, a gun like this should be put back to being as right as possible. That means sticking with the same barrel type and gauge. The only way i would consider making a change is if it is to fluid steel barrels. Making major changes to its original configuration would effect the guns lasting value going forward.
Your most cost effective option is keeping the original barrels and going with tube inserts.
If i was not so attached to a certain set of 30” titanic barrels that i have, i would have been offering them to you already.
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B. Dudley
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