Review on COX 63002 Berkshire Cartridge Pneumatic: Enhance Efficiency with Reliable Air Power by Rob Madden

This product was a great purchase for my project. I started with a pistol but soon found that it was almost impossible. I was looking for an electric caulk gun but it was very expensive. Stumbled upon it and had to buy it. I finished installing Sika sealant - 17 tubes. Worth every penny. Just today I used it to touch up. I was a little worried after doing the rest of the pipe that the piston wouldn't retract it wouldn't be able to move it. So I reattached it to the compressor and forced the piston to fully extend. Having set it in motion, it was possible to remove it completely. When I was done I poured some air tool lube into the fitting and pushed the piston in and out a few times. I think that should prevent it from getting stuck next time I need to use it.