Originally Posted by pedroarg
First of all thanks for the answers!
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.
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:
Thats why I asked the question , I did it and the same happened to mine , so , cheap effective non tech resolve , dare I say it might have been designed like that ?
FTP900 MTC connect,Welhamanium internals -sorted
HFT500, ACZ stock MTC connect
TX200 Mk3 CS1000 stock, hawke vantage sf , Nick G internals
Steyr ?, maybe , they cant all be wrong?