SM-1 Leaking down the barrel
I assume it's the cup seal? Yes, I've pumped it, I've owned it for 2 years and never had an issue before.
Does it take your standard autococker cup seal? I had some dude at the local field trying to convince me I need to buy an entire valve kit - ugh. Love the salesman in paintball.
Anyway, thanks for the feedback and answers.