Originally Posted by artguy63
Don't forget to machine the lip off the inserts.
And no I believe the shortest barrel was an 8". 6" isn't going to be very efficient, regardless of what you do. I believe 8" is about the shortest you can go and still have a mildly efficient gun.
It's more about paint to bore match than it is barrel length. Iirc, some folks on here could not get more efficiency beyond 8.5". After that, it's simply slowing the ball down.