Overwatch Precisions TAC Trigger kit for Walther Q4, Q5 SF, and PPQ pistols feature OP's proven TAC trigger design. Included in the kit is a NP3'ed and CNC-tuned OEM bar complete with two different trigger return springs for the discerning shooter. Overwatch Precision Tac trigger aides in a self-correcting rearward press, short reset and an improvement on the best OEM trigger on the market. As with all OP triggers, the TAC kit comes with pre-travel reduction and does not void any of the internal safeties. *Note:Polymer Frame Only, Not interchangeable with Steel Frame Specifications for Overwatch Precision PPQ/PDP TAC Trigger Kit: Manufacturer: Overwatch Precision Fabric/Material: Steel Trigger Shape: Flat Caliber: 9mm Luger Gun Make: Walther Gun Model: Walther PDP, Walther PPQ Finish: Hard Coat Anodized Size: One Size Weight: 0.5 lb Features of Overwatch Precision PPQ/PDP TAC Trigger Kit 58% decrease in pre-travel 50% decrease in total travel CNC-tuned NP3'ed OEM bar for constancy, safety, and quality Compatible with OEM return spring (provides a 5lb+ pull) Covered by Overwatch's Lifetime Warranty Package Contents: Overwatch Precision PPQ/PDP TAC Trigger Kit 3.8lb Red Return Springs 4.4lb Green Return Springs What firearm models does the manufacturer say Overwatch Precision PPQ/PDP TAC Trigger Kit is compatible with? The manufacturer suggests that Overwatch Precision PPQ/PDP TAC Trigger Kit is compatible with Walther PPQ, Walther PDP