I have this pump and am happy with it: lighter operation then my Hill MK5, and seems to be more durable as well. doesn't seem to have any air filtration or de-humidification though, does anyone know if there is a good solution for this?
Had the exact same problem with mine, and it grew worse over time up to the point that any dry fire would result in a jam and airdump. After inspection it seemed like the striker spring had shortened 3mm, so I replaced it with a new one and that fixed the problem for 2 days, after which it came...