I did my Flash QE with a Huma reg and the Plenum. Got it from Huma Air. Set at 110 bar from factory, gets a lot of shots (50 or better) Quieted the gun down and took alot of the "ping" out of it. I got into another project, but I believe it is well worth it and will tune the rifle some more when I have time this year. Mine is a .25 cal. The huma air web site has all the information you need to get the correct reg. Videos on U-toob will get you started and go slow if this will be the first time. I watched probably 5-6 times over before I said I got this. A chronograph will help if you want to jump way down the rabbit hole. Good luck!