Catcrew

I purchased a Black Maxx the other day. I am looking for cheap paintball guns for my son's friends when they come over to play paintball empty handed.

So I got this Black Maxx, there is an air leak at the hose that goes into the connection under the barrel. Is that an easy fix? How do I go about fixing it?

Next, I fired this thing and I have to cock it each time. Is this a single action paintball gun or am I missing something on how to fire in semi-auto mode?

Thanks