Alexander of Red Army Airsoft writes about the Tuffnation Airstock for HPA-powered airsoft M4 rifles that comes with a cylinder and regulator... "Sometime ago on the Vkontakte page of Russian producer WSC systems (Proteus), the company TuffNation posted a 3D model of their new product - the stock with an integrated cylinder and regulator - 'Product PB' ('Butt-cylinder').

Another video on Russian Airsoft HPA from Red Army Airsoft Club. Alexander shows us the Pro-T and Pro-T Proteus 2 modular drop-in kits for version 2 gearboxes and modular nozzles from Tuffnation. The Pro-T was also tested in this video at a range of 75-80 metres. In the video, it was mentioned that they also have bluetooth controllers just like their counterparts in the USA.