[2 clicks low]

Support your local gunsmith.

This is why they have them.
2cl

 

[2 clicks low]

Lets say that there are no gunsmiths nearby, and Since all I have is the barrel and mount. No smith will do it because I don't have a charger action.

Wish you would have said so first.
I would not have responded as I would not abet such activity. If you chose to build a class III, don't involve others unknowingly.