This is a barrel only, no barrel nut, FSB, FH tube - nothing but the tube.
Read this link for detailed info - Link
Barrel has around 3k rounds through it. It isn't DCM match accurate anymore but has proven to be MOA accurate at times, even out to 600yds.
I shot a varminter biathalon practice (200, 300, 400, 500 and 600 yd shooting all in one match) with it, in extreme wind, using hold over as my windage adjust with the following results:
The rifle was configured in a SAM-R clone:ASKING $95 shipped for the barrel. Payment by USPS MO