Thanks for the good review. Got some pretty good ideas on how the JP-5 works compared to the legendary MP5. This really helps when one plans to buy a JP-5 coz it ain't cheap.
The recoil with 147 subs is so little , I wouldn't worry about trying to run the comp. Maybe in SBR form it might make sense, but with this I say run 125-130 pf loads and enjoy the ride.
I have a banshee. The weak part are the extractor/ejector springs. It took me a long time to get it running. Then it ran for exactly 1 year before the springs died. Good gun, just keep an eye out on the bolt.