TriggerTech has developed and finely tuned three Pistol Caliber Carbine triggers to enhance the accuracy and precision of your rifle. Each model has unique specs and features designed for their specific platform. The AR-9 trigger s hammer design has more mass compared to our AR15 model, which increases inertia. The Center of Percussion is also lower in comparison to AR15, which is specific to the AR-9 platform. This allows maximum energy delivery upon impact with the firing pin, while reducing vibration and wear. Product Specifications Lever Type: Straight Zero Creep : Yes TKR : Yes - Min Overtravel CLKR : Yes - Inc. Adjustable Flat Wire : Yes - Hard Primer Compatible Take Up Distance: 0.035" Overtravel: Sub 0.015" Reset: Sub 0.030" Pin Size: Mil Spec 0.154" (trigger pins not included) Material: 7075 Aluminum & Stainless Internals Weapon Platform: AR-9 Warranty: Product Lifetime Trigger Pull: 3.5-6 lbs.