First of all thanks for the answers!
Originally Posted by vinny
Anyone tried firing over a chrono with hole blocked off and see whats happening ?
We tested it and if you blocked the hole the gun lost 50fps, change from 790fps to 740fps, may be because the blocked air stop the piston.
Originally Posted by scutter
What barrel have you put in,I assume it is a barrel with an internal o ring?
The new barrel is a LW with external diameter of 16mm (instead of 14mm), 450mm long (less than the original)
And no, the new barrel dont have an internal o ring, my friend/gunsmith prefer to add a litle cone to the needle. Thus, a possible deformation of the pellet is avoided when passing through an O-ring and a perfect seal is achieved with less wear. See the photo: