Airtac CRBN HPA upper Gen. 4 Color 155mm:Silver - 155mm Note that each back contains

Note that each back contains 4000rnds regardless of weight

but it was specifically designed for the above

To clean it

The square backspin patch is also made with nice edge support

Propane Bottle Adapter for airsoftguns

Airtac CRBN HPA upper Gen. 4 Color 155mm:Silver - 155mm Note that each back containsIntroducing the Gen 4 HPA CRBN Uppers a new level of durability! Airtac CRBN HPA Upper for M4 AEG bodies. Turn your AEG into a HPA speedsoft monster build with this fancy upper from Airtac Customs USA. Designed and made by Airtac Customs in USA, this is a nice uppper that combines style with efficient ergonomics. Made from a carbon fiber tube with a custom designed and 3D printed chassis that includes fiber rod front and rear sights. And it goes