The description does not specify. Please reach out to the manufacturer for more information.
Yes, it should fit. The second spring doesn't have a hole in the grip, so it can be tricky to keep aligned.
Not Affected by Chemicals, Load Size or Extreme Temperatures
Yes, the ATI AR-15 X2 Scorpion Recoil Pistol Grip is compatible with both AR15 and AR10 platform rifles.
The Ruger PC Charger is compatible with AR15 pistols grips. So the ATI AR-15 X2 Scorpion Recoil Pistol Grip should work with the Ruger PC Charger.
The ATI Outdoor X2 AR15 Pistol Grip is designed to fit most AR-15 and AR variants.
The ATI AR-15 X2 Scorpion Recoil Pistol Grip will fit the VR80 since the VR80 accepts AR15 pistol grips. However, you will have to remove the buttstock and replace it with a commercial spec buttstock.
The ATI AR-15 X2 Scorpion Recoil Pistol Grip will not fit your Scar 17 without modification to your Scar's grip tang. Tangodown makes a grip that will work with your Scar without modification. You can find that grip using the following link:
https://www.opticsplanet.com/tangodown-ar-rifles-reduced-angle-form-battlegrip-grip.html
Yes, it should fit a PSA mil-spec AR-15 lower.
This will come with whatever ATI includes direct from their warehouse. ATI states that their grips use the original hardware found on your AR, so this grip will not come with the grip screw.