The barrel was purchased from Airgun Heaven. It is a 710mm long slug barrel threaded for the Taipan Veteran. The muzzle is threaded for a 1/2 UNF moderator of your choice. The barrel is long enough to extend well past the air reservoir even with a couple power plenums attached. The barrel is unchoked and has a 1:15 twist rate. The diameter is a true .22 so it likes to shoot larger diameter slugs best. I will be throwing in 32 sample packs of different slugs worth $160 that are all larger than .218 diameter. They should give you a good start on testing the barrel in your gun. $250 shipped PayPal friends and family. Thanks for looking.