I have a 15" .45 Colt / .410 vent rib shotgun pistol barrel. It has been Duracoated in a flat-black finish. The choke and choke key are included.
When I purchased it, it had some rusting near the muzzle end on the outside of the barrel (no rust on inside). I bead blasted it to bare metal and noted it was pitted from the rusting. So instead of bluing it, I Duracoated it. It came out very nice, but you can see where the pitting is. It's been several years since I re-finished it, with several trips to the range. It has never re-rusted.
I had a gunsmith try to drill and tap a forward hole for a rifle forend to be used with it, but he didn't go deep enough, and the hole he drilled appears to be one size larger than it should have been for the correct size tap. Therefore, a screw wouldn't remain there, so I Duracoated inside that shallow drilled hole as well. It does not affect the use.
Trades considered for the following (I can add some cash for the right deal):
Contender Octagon barrels in 22 WMR, or .22 Hornet
Contender Super 14" barrels in .223, .357 Herrett, .44 Mag, or 6mmTCU
Encore rifle or pistol barrels - .44 Mag, .300 Blackout, .257 Roberts, .25-06, .30 Carbine
All the best,
Closeup of the refinished pitted area:
View of the additional forend screw hole that was drilled (far left is the extra hole):