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 lb total trigger pull comprised of a 2-2.8 lb first stage followed by a 1.2-1.8 lb second stage. All components are black oxide coated to provide outstanding corrosion protection. The trigger kit comes complete with all parts, springs, and installation instructions necessary to install in any SCAR 16s or 17s. Notes:The Geissele Super Scar trigger is designed to fit into the standard FN factory polymer trigger housing ONLY.