Military-type AR triggers tend to be heavy and gritty, so when the KE Arms folks set out to design their SLT-1 Curved Trigger solving that problem was their first goal. They also wanted installation of the SLT-1 to be a simple, drop-in procedure so any AR-15 owner could do the job. Using their innovative "sear link" technology, KE Arms team eliminated the disconnector entirely, producing a constant engagement between the sear and hammer that gives a smooth, consistent pull. And it ensures the SLT-1 trigger resets quickly, ensuring lightning fast follow-up shots. Since there’s no disconnector, energy is conserved and concentrated, producing that gratifyingly smooth pull with less wear and superior longevity. Self-contained, drop-in module fits mil-spec fire control pocket Single-stage 4.5 lb. "Goldilocks" pull - not to heavy, not too light Pre-set at the factory to have minimal takeup/overtravel (not user adjustable) Drastically reduces split times Fits standard .153" hammer/trigger pin receiver holes Available alone or packaged with KE Arms ambidextrous safety that can be set to 90 or 45 throw The SLT-1 even lets you engage the safety regardless of whether the hammer is cocked or down. This greatly reduces the risk of an accidental discharge when transitioning or clearing malfunctions. On the ergonomic side, the SLT-1’s traditional curved shoe guides your finger into the same location for every shot, ensuring a consistent pull. Finally, all moving parts are sealed inside the housing, protecting them from fouling and debris. The KE Arms STL-1 curved trigger is compatible with any mil-spec AR-15 lower receiver, pistol caliber blow back systems, and the SIG Sauer MPX. (Will not work with SIG MCX firing pin safety.) Also available with a straight shoe - #100-027-835.