This kit includes the mainspring housing, internal components, and multiple spring weights so you can tune the gun to your preference. It’s designed to give you control over how the gun cycles and returns without having to swap individual parts. Everything is contained in one system that installs clean and stays consistent. Adjust it once, then run it.

Notice: All parts built as “Drop in” for any UGW Firearm. Usage in any other 2011 style platforms will need installation by a gunsmith.”