I bought a pre-owned HW95 walnut in .177 cal from AOA. When it came in, it looked brand new and not a mark on it. AOA test sheet showed velocity of 888 fps with JSB 8.4 gr pellets. Boy, was it twangy. I replaced the innards with a Vortek PG4 HO kit and before in put it in, I cut one coil off the spring figuring it would make it a little smoother. Velocity then jumped to 927 fps. The twang was gone but the shot cycle was really snappy. Accuracy improved too, but I kept getting a flyer every 10 or 15 shots. Still not satisfied, I replaced the HO spring with a 12 fpe spring from Tom at Vortek. Now, it's shooting 8.4 AA pellets at 840 fps for 13.2 fpe and 762 fps with JSB 10.3 gr at 13.0 fpe. The shot cycle is much smoother and the cocking effort is just right for my 85 year old carcass. I guess the power level is about what an HW50 is. I really like it here. Accuracy is top notch and I've decided this rifle is a keeper.