8 mm reinforced gearbox v. 2 with ball bearings from SHS (ref. Super Shooter). QSC options with a quick replacement without springs around disassembly. Gearbox weighing 130 grams is made of CNC milled from high-strength aluminum 7075 (aerospace aluminium). Today, it's about the toughest gearbox market, which after proper installation and regular servicing even more cracked to anyone!!! According to the experience it is guaranteed durable resistance for the strongest springs as the M190 from SHS. Supplied with ball bearings 8mm, steel spring guide QSC with rotating axial bearing, set screws and washers beneath them.