I decided to replace a .22 barrel with a .177 item. I have some spare barrels so decided to give them a bit of a polish to remove surface -rubbish-.
When cleaning up the ends of one of the barrels ( an old 24" BSA item) I noticed that the rifling seems to be contained in a thin barrel (8mm) and extra steel put around it to make the thin barrel up to 16mm. Hammer forge marks are visible on the outer. Is this normal? i have a 19.5" weirauch and a 28" walther barrel and they seem to be made of one peice of steel. No sign of inserts. Can anyone enlighten me?