An update from Magpul PTS on the PTS SSG Fire Selectors as more brands are covered... "The new PTS SSG Selector Sets are drop-in, fire-control selectors for the M4/AR15 family of weapons. Designed for users who desire a unique look and demand more positive control of the selector, the PTS SSG are direct replacements for three different versions of the airsoft M4/AR15 rifle system.
It's the airsoft market that gets the Magpul PTS SSG selectors for the M4 rifle whilst the real steel market only gets the version for the FN SCAR... "The PTS SSG Selectors – M4 GBBR are drop-in, dual sided selectors for the WA and G&P GBB family of weapons. Designed for users who demand more positive control of the selector, the PTS SSG are direct replacements for the WA / G&P selectors, and require no permanent modification to the weapon system.
For the FN SCAR users, you can use this Magpul SSG Selector Set which costs US$19.95. While this is made for the real steel version, this may also fit airsoft versions with just some modding, if need be... "The Magpul SSG Selector Set are drop-in, dual sided selectors for the FN SCAR family of weapons.