OK, "sleeved". Cut barrels off ahead of chambers, maybe 3 1/2". Counterbore chambers so a "sleeve" can be inserted, the sleeve including a full length barrel of normal dimensions. The sleeve is sweated, soldered, whatever, in place and the outside of the new barrel and chamber is filed so the joint is hard to detect. The rib is then reinstalled and the whole package reblued. This was done in the sixties because composite barrels were thought to be unsafe. Your unstruck barrel weight is marked 5-4 which suggests that this may have originally been a ten gauge gun. What is the number (probably 2 or 3) stamped on the bottom of the rear barrel locking lug? This is your frame size. Give us these markings as well as rib markings and we can help you. How long are the barrels?
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