The SIG MCX Trigger is built for top competitive shooters to offer the most accurate and dependable trigger on the market. Featuring Frictionless Release Technology™, this drop-in AR trigger has a short, two-stage action, designed to feel like a 1911 trigger, that provides a true zero-creep break, extremely short overtravel, a sub 0.015” tactical reset and offers outstanding reliability. Pull weight range of 3.5 - 5.0 lbs CLKR Technology Available with curved or flat trigger lever Zero Creep Technology™, along with hardened 440C stainless steel internal components ensure corrosion resistance and an extended service life. As Zero Creep Technology™ does not rely on coating, polishing or lubricating the key engagement surfaces, trigger pulls will be more consistent from shot to shot and after thousands of shots than you ever thought possible. All pull weights and measurements are approximate. Trigger Control Details Lever Type: Straight or Curved Zero Creep™: Yes 1st Stage Weight: 0.75lbs - 0.75lbs 2nd Stage Weight: 1.75lbs - 4.25lbs Total Pull Weight: 2.5lbs - 5.00lbs 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: SIG MCX (and pump action AR) Warranty: Product Lifetime Material Details Housing: 7075 Aluminum (anodized) Key Components: 440C Stainless Steel PVD Black – PVD stands for Physical Vapour Deposition. It is a hard and durable coating that is applied to external stainless components to give them a clean black color.