The Timney Arisaka Model 99 Single-Stage Curved Replacement Trigger is designed to deliver a clean and consistent trigger pull and crisp break for superior accuracy potential. This drop-in trigger features a lightweight aluminum housing with a durable anodized finish for exceptional strength and lasting service under extreme conditions. This self-contained replacement trigger is calibrated and ready to shoot straight from the factory, but it is also fully adjustable for pull weight, creep, and over-travel for a custom feel. Further, this performance-enhanced trigger also boasts a unique trigger-blocking safety system that provides reliable drop-safe performance, ensuring the trigger remains completely stationary when on safe and protects against accidental discharges for added peace of mind. Drop-in installation.