Review on 💪 3-Stage Stainless Steel High Pressure Hand Pump for PCP Air Gun, 4500psi, Ball, Tire, Boat Filling - Includes Stirrup Pump (Silicone Oil NOT Included) by Dave Brummet

It's hard to tell if these Chinese made air pumps are inferior copies of more expensive and possibly higher quality air pumps sold under the Benjamin, Gamo, Air Venturi etc brands, or if you're just paying for a sticker with the latter . Yes, the instructions are poor. You'd think the marketing department could give an English-speaking employee an extra $100 to write logical and grammatically correct directions. Damn! "HIVBEE" documentation and instructions state "O-rings and other accessories". There is no parts list and what I received in the box did not match the picture in the instructions nor the Revain listing. So I had to make a 16 mile round trip to Ace Hardware to get the right o-rings before I could complete the build. It seems the upstroke is slightly binding. I covered it with a drop of silicone oil and it worked better. The downstroke appears to inject only a small amount of air, which can be a characteristic of high-pressure pumps. As this is my first deployment, hopefully someone with more experience can clarify