Here's a review of the Just Right Carbine. Hat's off to the fellow for going out in 11 degree weather to record his day at the range. The JRC is an AR-ish PCC that takes Glock magazines, like a Kel-Tec Sub 2000 in Mag Pul clothing. O.K. good start.
No muzzle velocity data. He has some nice gear, but no chrony? He mentions that the trigger is rough. Very rough. Also the mag release is located right at the center of gravity where it's most comfortable to hold the gun with the left hand.
Accuracy: Using the red dot sight and 10 rounds to determine holdover, it scores rather less than 50% hits on a 24" square target at 300 yards. This does not inspire much confidence, notwithstanding that those 9mm rounds aren't going to be traveling very fast at that distance anyway. 24" at 300 yards is 8 MOA which is mediocre at best. Next time put some paper up at 50 or 100 yards and show us your best group.
Price: MSRP is not mentioned. It is a blowback gun in spite of the AR-like construction so shouldn't be too expensive.
I like PCC's, they let you do all the carbine-y stuff without costing $1/round to pull the trigger. It would be nice to know a bit more about this one.