Gel Ball Undercover got a Custom GBU & Stig HPA Gel Blaster to show in this video... "This insane HPA build features a Eurotactics Grip, Polarstar F2 Engine, Monk Metal Gearbox and Monk Carbon Fibre handguard just to name a few of the insane accessories on it.

This is literally a one of one HPA build, and likely will never be repeated."