The Super SCAR Trigger by Geissele is a two-stage, semi-auto only, drop-in replacement trigger. The Super SCAR gives a clean and crisp 4-1/2 lb total trigger pull comprised of a 2-1/2 lb first stage followed by a 2 lb second stage. All components are black oxide coated to provide outstanding corrosion protection. The trigger kit comes complete with all parts, springs, lubricants and installation instructions necessary to install in any SCAR 16s or 17s.