Lol ... Some have seen this conversion before, some not
This started life as one of the Pre-release "Demo" guns from a couple years ago. It is the steel air tube, non regulated .22 cal "Standard"model .. or should say "Was"
These last few years screwing around inside the action, it got a Peek poppet, Cobra air spring & SSG devise for zero hammer bounce etc ...
Action then placed into a modified Diana 75 10 meter stock & ( Inletted ) to fit the JTS standard action.
As originally set up was about a 37-38 FPE rig with heavy pellets and provided @ 25 shots with a decent ES value.
3-4 months ago decided to Regulate it fabricating a reg holder / plenum spacer using an OEM Max model reg. As expected the power came down with it having a mid output tune @ 28 fpe. Tune was fairly mild and rifle was making a solid 40 regulated shots on a 3k fill with reg sitting at @ 1700 psi.
*** Over the weekend pulled the factory barrel/shroud off ( 17" barrel BTW ) and fit a 16mm barrel at 25" long into the receiver making sure it was all bedded in and wiggle free.
With the added 8" of barrel the POWER jumped way up and changing NOTHING in tune it is back to making 36 FPE with a 21g pellet or slug and gives the same 40 regulated shots !!!
While it is a tad heavier & longer it shoots just fantastic !!!! making it a real gem made up from an inexpensive base model into a VERY capable target or hunting rig.
Pic #1 with stock barrel / shroud
Pic #2 with new barrel & ldc fitted.