Pcp air pump - Hatsan TactAir 3 Stage PCP Hand Pump

I have used my Hatsan 3 stage pump for the equivalent of about 4 complete empty to full refills on my Hatsan Blitz, which has a rather large tank. The initial assembly of the fittings requires good attention to detail, or you will have leaks as the pressure rises. The instruction manual isn't very detailed, and the illustrations require careful attention. My mechanical background was helpful. If you don't like physical exertion, then using this pump isn't for you. I'm 60, weigh 165, and I can get my PCP tank to 250 bar (3600 psi) without too much trouble, just takes a lot of strokes to fill the tank. Pumping to 3600 psi from 2000 takes (estimated) nearly 400 strokes. The exercise is good for me, leaves me sweating.