Super clean, low miles ready to rock Blackhole Weaponry 18" stainless SPR barrel. Round count 49. Accurate as they get, I decided to pick up a 24" heavy and a 16" light weight in the same chambering so I have no need for this barrel. This barrel flat shoots. Blackhole Weaponry Type I bolt (Bolt not included) Rifle length gas 5/8-24 thread(Muzzle) .264 LBC / 6.5 Grendel .750 gas block seat 18" SPR contour .870@ the extension tapers to .850 @ the gas block step down. .750 diameter for the gas block seat to the suppressor collar(Ops Inc) step down .730 on out to the threads. It is lighter than their standard contour and heavier than their light. This is a custom contour and not listed on their site. 3P (Polygonal) Rifle length gas 8 twist M4 extension Machine finish **** Bolt not included *** They are available through "Tactical Ammunition" web site.sister Co to BHW. 225.00 shipped. PayPal plus fee or as gift. Will consider trade for a 6x45 / 6mm-.223, .243 LBC barrel or a quality billet AR upper receiver. May consider other AR parts trades. I could always use a quality 16" + key- Mod handguard. Shoots the factory Hornady 123gr A-Max and 123gr SST under 3/4 MOA. This was 7 rounds at 100 yards out of this barrel with the 130gr Accubond.