NSZ 85's full installation of the ELF AR-15 match Trigger and AR-15 Non-Rotating Anti-walk Trigger and Hammer Pins on a San Tan Tactical lower receiver. NSZ 85 provides a full overview of the ELF AR-15 drop-in trigger system. See the easy-install process from start to finish. Each ELF trigger is fully contained in a modular design that allows for a super fast install.