Umarex Zelos FX Barrel Kit (500mm) 500mm:.30caliber It will come with orings

It will come with orings needed for the installation

This will allow you to up the reg for more fpe or assist with longer dwell time

has better feel then factory

The plenum will move the main air reservoir 45mm forward so you would need clearance

IF you prefer a custom weight reach out to me first before making the purchase

Umarex Zelos FX Barrel Kit (500mm) 500mm:.30caliber It will come with oringsCustom FX barrel kit machined to fit the Zelos. This will allow you to utilize the 500mm FX liner in . 177 . 30cal. The kit will come with everything needed besides the FX LINER. No modification is needed and it is a simple swap. Note: The stainless steel housing does have blemishes (thats how I received them) Note: YOU will need to source your own FX LINER