I picked one up,it's just as accurate as the regular length JW15 ,which is just as accurate as my BRNO.The only difference between the 13'' short barrelled one and the 24'' one us the shorter barrels is perceptibly louder.The shorter barrel doesn't lend itself to open sights well so I put a 2 1/2x scope on it and use it for a grouse gun,and it served that purpose handily .I do gave a couple of 22magnums,but find the regular 22LR quite acceptable ,and actually use the lower velocity 'quiet 22' shells which are very accurate.
It's not as finely finished as my BRNO ,but I find the action smooths out with some use.This is a working rifle,not a show rifle