I did a new test.
When I insert the magazine with the open slide (after a empty mag) i seems that the TM magazine works well. and I did a similar test with the original KJW mag and after inserting it with open slide tue shooting power appear more powerful and also without reading fps with a chrono I am pretty sure.
Summarazing the issue should be the valve knocker that doesn't ita the valve well, but I can't understand where is the issue.
Need help, please
ps I am pretty sure that tha issue may be in the valve knocker because the surface presents irregular wear, so I don't even try to modify the Guarder knocker but I'll buy the Sooters design one
http://www.airsoftparts.ca/store2/in...roducts_id=923