I have diver's silicone grease. Will that work?

My S510 makes a high pitch whistle when I'm filling the air tank. It usually starts when the pressure matches the pressure in the gun's air tank. What causes this? Can it be fixed?

As I mentioned earlier this week, just got my S510 US FAC a couple of weeks ago. I was looking at a web site recently and realized that the gun comes in two configurations - with and without the QTec moderator. Mine is without the moderator. My question is: does the Q Tec moderator also act as an ai...

It is the extra model.

Hi all. I'm new to this forum as well as Air Arms guns. I just bought an S510 Ultimate Sporter.The power knob seemed too easy to move and then I found that there was an adjustment screw that can be tightened to alleviate the problem. My question is - Can the screw be overtightend? I realize that it ...