A small scribe at the joint between the rib and barrel. If it soft it's soldered. Most SXS are soldered the full length. Another way is to remove the barrels hang by the lump and tap the barrels with a piece of metal. The barrels should ring and ring bright. If they sound dull you either have a set that has come lose or they were never soldered full length.
Like I said I've never seen nor heard of a SXS not soldered full length the had a rib running down the barrels.
The other thing is I would have the wall thickness checked on those barrels among other things. It may not be safe to shoot.
Originally Posted by ar15barrels
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Last edited by kcstott; 12-12-2012 at 10:29 AM..