Dr Mugen have sent in a video and details of their new spring guide:
New type suspension spring guide "never broken system for marui gear box and piston"
1 .. gear protection
2 .. Piston protection
3. The battery efficiency increases
4. Gearbox durability
5 fire a bullet at a stable speed, accuracy increases
6. Korea was adopted at an Army training durability airsoft gun
7 Any two types, three types can be used gearbox(Dr Mugen)
