JP Enterprises CMP 4.5 Pound Spring Kit 4.5 Lb With Trigger Kit Silver. 5 pound spring kit (4.5 lb with JP trigger kit) Specifications for JP Enterprises CMP 4.5 Pound Trigger Spring Kit: Manufacturer: JP Enterprises Condition: New Color: Silver Additional Features: with Trigger Kit Features of JP Enterprises CMP 4.5 Pound Trigger Spring Kit: CMP 4.5 pound spring kit 4.5 lb with JP trigger kit Package Contents: JP Enterprises CMP 4.5 Pound Trigger Spring Kit JP Enterprises JPS4.5: CMP 4.5 Pound Spring Kit (4.5 Lb With Trigger Kit) Silver