This barrel was finished by Fred at 4D reamers, not by McGowen, its a match chamber, no turn neck with just enough freebore to shoot factory ammo, .115", but its better to handload for, oal with a 210 Berger touching the lands in this chamber will be about 3.845" +or- .010". This barrel cost me 360 plus shipping and another 150 for the brake+install, so as I stated I have actually a little over 510 invested, I decided I would let it go for what you can get one from McGowen for even though they don't have this reamer, their price is 339 plus shipping so I will go 355.00 shipped, and you practically get a Vias break installed free. Barrel weighs around 7#s.