COWCOW Technology Aluminum CNC Tactical Magbase for Marui G GBB Pistol (Red) Net-Weight-(g)_68 and the stock tube has

and the stock tube has also been increased in size

Aluminum outer shell

The 417 is the 7

steel gears

COWCOW Technology Aluminum CNC Tactical Magbase for Marui G GBB Pistol (Red) Net-Weight-(g)_68 and the stock tube hasCOWCOW Technology Aluminum CNC Tactical Magbase for Marui G GBB Pistol (Red) Aluminum material with CNC machined Shifting pin holding system can latch the magazine tightly Special groove design offer plenty of grip Easy to attach and detach from the magazine. It may has a condition that your pistol cannot feed the BB bullet due to lightweight gas supply. You just simple remove a spacer to solve the issue. Alternatively, you may consult your gunsmith