Hi Jim
Thanks a lot for your ( allways simpathetic ) input.
Turn off barrel, or screw off barrel.
It means that the barrel is not an entire piece, but divided in two sections. The advantage is that, when you screw it off, almost all cilindrical part comes out, leaving a chamber just after the breech, where you can place a bullit a little wider than the actual barrel bore ( caliber ) increasing the shooting pressure and therefore improving the direction accuracy. When bullits are ramed through the barrel muzzel, they have to be narrower than the actual bore, for a couple reasons ( this difference being called vento=wind ) decreasing the said pressure and consequent precision.
I hope i made myself understood.
Kin regards
fernando
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