Mmmmmm....... We would weld and repair body track ribs if the rest of the rifle body and barrel was worth saving. But wear to the extend of thread 3 would be BER/ZF. BSA didn't do the Mk1/1 to 1/3 modification for the UKMilitary. But if you gathered in 20 or so needy Mk1/1's and 1/3's together for repair, it was a speedy repair at a Field or Base workshop. It was definately not permitted to remove the US Property markings on our or allies rifles. They weren't ours to interfere with! They were loaned or leased to us!