If you've been looking for an external regulator and considered this one, don't hesitate - buy it!! This has been a game changer. The ability to precision tune any of my unregulated air guns has been taken to a whole new level of ease and precision. I was on the fence for a long time about this item due to the price, but I have never been so happy with an item I've purchased before. The Regman 2.0 has allowed me do tuning that previously took days, if not weeks, and hundreds and hundreds of rounds of ammo down to a fraction of the time and ammo. I can now get "exact" data on what PSI, hammer spring, port and grain weight combinations work best for each of my rifles. I am shooting tighter groups than ever before and know exactly what set up works best for each of my rifles. The guess work of constantly changing variables is over! The Regman may very well be the best airgun purchase I've made to date.