Comes with a Black Magic seal(lifetime warranty). Does what its supposed to.
none so far
Bought this because i wanted to get more shots per fill on my tank. Its easy to install as long as you know how to take apart your gun. only problem i had was that one of the o-rings snagged and wedged itself between the valve and the tube. I had to cut the oring and pull it out. Then replace the oring. No big deal.
Great product with a Black Magic seal, never have to worry about it crapping out.