Patriot Ordnance Factory 00858 Drop-In Black/Red Flat Trigger Single-StageThis single stage, non adjustable, drop in trigger boasts a solid 3. 5 pound pull weight and is pre assembled in Hard coat Anodized aluminum housing for immediate competition, hunting, and tactical applications right out of the box. Carved from American A2 steel, the Trigger, Disconnect, and Hammer are all Nitride Heat Treated to 70 Rockwell case hardness for ultimate strength and corrosion resistance.