I will point out here and now – if you do not rifle the tubing for the barrel – you are violating an unconstitutional federal law . . . .
What’s in your garage? . . .
https://www.acehardware.com/departments/lawn-and-garden/gardening-tools/digging-tools/7011414
https://www.harborfreight.com/120v-spot-welder-61205.html
For educational purposes only . . .
If you want to purchase a reproduction . . .
https://vintageordnance.com/products/voco-fp-45-liberator-pistol
Have Fun! – Run the Gun! – and remember – Fish Heads are Cheap!!