Make sure you get some spare gears for this beauty.
Thats the first thing I did.
Apparently it fails quite easily.
Its understandable;
its "cheaper" to replace gears than that sophisticated piston.
Also the design of the mechbox is quite well thought out
Shim the gears, I've read many reviews that its a "weak" point in the gun.
Here's a useful review for the gun
http://www.arniesairsoft.co.uk/forum...opic=97523&hl=