Re: best position to store a gun?
I always leave mine forward. To me (idk if this is correct or not) I think having the valve spring compressed is ok because the pressure from the gas will help seal it anyway. All the valve spring is used for is to push back the valve pin and cup seal after the hammer has hit it. So if the valve spring is not as stiff as it used to be it's ok, it's just going to be a little more inefficient and blow more air through the valve to re-cock your marker than it needs to.
Spyder Classic Single Trigger Frame
M16/AR15 Carry Handle
PCS MX-16 Barrel and Shroud
Rap4 Clamping Feedneck
6 Point Collapsible Stock
M16/AR15 Recoil Pad
M16/AR15 30rd Magazine
Custom Milled Side Cocking Slot by ACP
ACP Slim Delrin Striker with Side Cocking Hole
Spyder Classic Side Cocking Knob