I have a nice 6mm White Oak Arm complete AR15 upper for sale. The barrel was made by John Holliger who designed the cartridge. It is a 20in tube that is bead blasted. The barrel is threaded 5/8 x 24 and has a break. I'm not sure but the brake may be a JP. 15in Troy alpha rail is installed. The bolt carrier is a semi. Approx 500rds down the tube. I will throw in a set of Forrester dies and a case gauge. The load information sent with the barrel will be included. $650.00 OBO PS. The 6 WOA round is an easy conversion. Just run 6.8 SPC cases through the sizing die and trim to length. No fire forming required. This round is capable of slinging Sierra 107gr 6mm match bullets quite well.