Overwatch Precision OP Increased Power Spring 3-Pack Steel. These are designed for competition use only and not recommended for daily carry. Replace your factory spring with this upgraded trigger spring for greater performance a clean and crisp reset and increased reliability. The installation to update the original spring will be quick and easy. This handgun part will be an essential addition to your Glock pistol assembly is made from the best spring material and is offered at an affordable price. Specifications for Overwatch Precision OP Increased Power Trigger Spring: Manufacturer: Overwatch Precision Color: Steel Fabric/Material: Steel Gun Make: Glock Model Generation: 4 3 2 1 Package Contents: Overwatch Precision OP Increased Power Trigger Spring Overwatch Precision 21003: OP Increased Power Spring 3-Pack Steel