This is my second PCP, my first is a Beeman Chief 2.I don't have anything in the hole of the Chief, in fact I degass through it but noticed this immediately on my new Gauntlet 2.Probably shouldn't have but tried to fill it but it does take air. Only have it to 2000psi right now to see if it holds air. When filling it makes a more pronounced pst pst pst every time, like it's hitting something or letting air out.Should I try to poke this out or is it some kind of new filter/back pressure plate? It looks like some kind of foil...