^^^^^^^^^^
I am not sure about that.
From a legal p.o.v., "counterbored" when
the "rifling inside has been shortened significantly"
would mean exactly "shortened" IMO, since in Canada,
the length of a barrel is measured with a rod inserted in the bore,
from the face of the bolt to the forward end of the rifling.
Breechface to muzzleface.... Really?If that were the case, no shotgun would have barrel length.
Rifled, smooth, it doesn't matter. Breechface to muzzleface. Doesn't go back inside the barrel.
Breechface to muzzleface.... Really?
Then, if I was you, I would make a pretty penny
turning restricted M1 Carbines into non-restricted
by simply soldering a short piece of bushing onto the muzzle.
But before, ask the RCMP Lab and see what they have to say about that.



























