Barnett BCR Recurve Crossbow Technology features an Anti Dry Fire Trigger which is a state of the art mechanism that protects the user from shooting the weapon without an arrow in place. The patented Anti Dry Fire Trigger has a spring loaded redundant safety bar that remains in place until the arrow is seated properly, which finally allows the user to switch the safety off and shoot the bow. MIM (Metal Injected Mold) trigger is metal injected molded which allows for the tightest quality tolerances available. This accounts for the refreshingly smooth trigger pull at 3.5 pounds. Less jerking and ultimately tighter groups. AVI (Anti Vibration Isolation) patented high compression over molded limbs and/or components. This reduces noise and vibration by up to 30%. Avid also helps prevent inadvertent nicks and scratches and provides a protective barrier.