Finally got mind. Solid piece, heavy weight. Low recoil, not high rof.
First got it, the trigger sometimes not working, also bolt lock locked itself without mag on. But it shoots straight and seems with very tight grouping. May be it shoots hot at 430fps.
Spent hours to disassemble it, found that most are port metal as usual but mix with some aluminium piece. The design of the trigger box is a bit complicated and hard to service for the first time. The bolt seems like no way to be disassembled for service that I may have try other time see if I could.
After fine tuned and lubed it. Now it shoots flawlessly. Will try to adjust through trigger engage distance and shorten the bolt traveling to increase rof, or even increase the recoil spring see if could bring up the recoil.
Since this design of the trigger is in front of the magazine so there is a metal piece connect with trigger an trigger box for functioning. So the way to pull it feels a bit strange. Will post some disassemble pics soon.
And yeah, it could be changed for left handed with not effect the functional. All you need to do some extra work on firing switch and bolt cover.
