This JTS "Standard" started as one of the original "Testers" from about 3 years ago.
The internals have been a work in progress now having a Cobra valve w/ peek poppet, SSG devise and regulated too.
Full Blue print job, Trigger work etc rounded out the action modifications.
Glass an old school Hawke Varmint 2.5-10x42 1/2 mil having short eye relief perfect with the shorter LOP stock has.
The fitting of the JTS into an RH vintage Diana 75 stock done a few years ago & it turned out looking and fitting as if a factory offering ... So nice
OEM barrel was ok, but wanted match grade accuracy as all the previous work had the mechanical functioning just stellar being smooth and very low vibration.
Was using a KARMA .22 test barrel in it last year and while much better, still lacked what I knew rifle was capable of ..... So In went a RAW .22 cut rifling barrel at @ 23" w/ air stripper and a tensioned shroud having barrel held Very stiff !
It shoots near hole in hole inside 40y and still stacks em out to @ 80y using JSB 15.9's at @ 940 fps. The transfer choke knob still allows throttling the output down to the mid 500 fps range or anyplace in between.
On a 200 bar fill we are getting 5 mags ( 50 shots ) under regulation so the efficiency is quite good. Noise on just a shroud is a modest pop, screw on a moderator it gets shockingly quiet.
Previous thread with 1st barrel trial:
Airacuda maximised
Some other internal tweaks since has found another mag ( 10 ) shots in efficiency.
The internals have been a work in progress now having a Cobra valve w/ peek poppet, SSG devise and regulated too.
Full Blue print job, Trigger work etc rounded out the action modifications.
Glass an old school Hawke Varmint 2.5-10x42 1/2 mil having short eye relief perfect with the shorter LOP stock has.
The fitting of the JTS into an RH vintage Diana 75 stock done a few years ago & it turned out looking and fitting as if a factory offering ... So nice
OEM barrel was ok, but wanted match grade accuracy as all the previous work had the mechanical functioning just stellar being smooth and very low vibration.
Was using a KARMA .22 test barrel in it last year and while much better, still lacked what I knew rifle was capable of ..... So In went a RAW .22 cut rifling barrel at @ 23" w/ air stripper and a tensioned shroud having barrel held Very stiff !
It shoots near hole in hole inside 40y and still stacks em out to @ 80y using JSB 15.9's at @ 940 fps. The transfer choke knob still allows throttling the output down to the mid 500 fps range or anyplace in between.
On a 200 bar fill we are getting 5 mags ( 50 shots ) under regulation so the efficiency is quite good. Noise on just a shroud is a modest pop, screw on a moderator it gets shockingly quiet.
Previous thread with 1st barrel trial:
Airacuda maximised
Some other internal tweaks since has found another mag ( 10 ) shots in efficiency.
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. Sounds like it shoots as good as it looks. Stock really looks good on it. 
