KBCraig
NES Member
This is interesting because surplus rifle barrels have been used as rebar. Here, a guy drills out a piece of rebar, installs a .22 liner, and attaches it to a break-action receiver.
DIY Barrel Made of REBAR and Rimfire Barrel Liner - The Firearm Blog
DIY Barrel Made of REBAR and Rimfire Barrel Liner - The Firearm Blog