At the IWA Outdoor Classics 2023, Guang Su of King Arms walked us through the various features of the fully licensed Black Rain Ordnance GBB PCC series  which boasts of good blowback mechanism as well as CNC'd one-piece outer barrel, steel Black Rain Ordnance Hexagonal Competition Compensator, and CNC'd M-LOK slim handguard. It also has an adjustable 30 to 50 round BB capacity gas magazine.