I have one and I went thru some issues with it, but now I don't I would get rid of it. I have barrels in .30 and .177 and they both shoot lights out. Like half moa at 50 yards lights out. The issue I had with mine was I had one of the early models with their first generation valve. It never wanted to seal properly and leak down over the course of a week or so. I could never get in touch with anybody at JSAR. I even had it listed for sale for quite a loss. At some point I actually got a response from someone and was able to get a new valve and now it holds air great.
The amount of tuning that you can get with one valve and reg setup is astounding. Having AR furniture makes getting it comfortable for you relatively easy. Mine needed a new grip and butt stock for me to enjoy shouldering it. And Magpul pic rail grips, those made a big difference. It also took some time for me to understand how tuning works, and not just how to tune to a certain fps. The reg does creep, but I found that setting the hammer spring for more preload than is needed to open the valve at the target set-point and adjusting the valve dwell for the minimum needed for that set-point then a difference in 200psi at the reg makes no difference in the fps of the shot. So basically the amount of force the hammer imparts on the valve is enough to open it fully at 1900-2100psi and the depth the valve is opened is set short enough that it gives me the fps I am looking for across those pressures. This is not optimal efficiency tuning. I only get 35 or so shots at 80fpe with the .30, but I have tuned it to get 65 shots at 73fpe. I can also tune it for 100's of shots at 12fpe in .177. It does take some time and chrony time to get changed from caliber to caliber, so I tend to set it for one or the other and leave it for a while. I think that I would rather have a single gun for a single caliber instead of one that can swap for that reason.
I do not know if I could do it all over again that I would, but probably because I understand the gun so much more not than if I'd have gotten something that just worked out of the box and having that knowledge is pretty valuable to me. I still don't really like the trigger but I have been spoiled by top end Timney triggers. It has decent adjustments and I have it where I like it but it does not work well with the safety design at the weight I like it set. The reg creeping I can live with, but I don't love it. All that said I have seen that JSAR is developing a gen 2 version of the Raptor and will be addressing all of the things most had issues with. It will have a new reg, designed and built in house, and a new valve that I think I got. The company had growing pains and a lot dumped on them at once and they are fighting through. I truly hope they succeed and I am tempted to buy one of the gen 2 models when they come out.
