I don't think the proposed work is feasible. Double rifle barrels normally are very thin, so removing enough metal to insert a liner is going to be a big issue. Assuming it can be done, the cost of such a procedure would be high. What is the value of the end result? If the rifle is ragged out now you aren't going to end up with much.

What is the make, vintage, and caliber? There is no such thing as a "generic double rifle." They are all individuals.

Contact Kirk Merrington. He has the skill to make double rifle barrels from scratch, so he surely can answer your question. Just be ready for the sticker shock!

Kirk Merrington Gunsmith
207 SIERRA ROAD
KERRVILLE, TX 78028

Specializing in the Repair and Refurbishing of Fine English, European, and American Double Shotguns

English Trained Gunsmith - Over 30 Years Experience

(830) 367-2937 - Workshop
(830) 367-2950 - Fax

kirknkk@ktc.com

Good luck,
Curl

www.RoscoeStephenson.com

[Linked Image from rbsiii.com]