Airtac CRBN HPA upper Gen. 4 Color 155mm:Purple - 155mm Each valve has a unique

Each valve has a unique marking to indicate it's powerlevel

Low and Very Low

it is easy to adjust the hopup through the window cuts on either side of the body

Ambidextrous design allows the user to push on either side to release the magazine

-Lower profile than TDC Shield MK1

Airtac CRBN HPA upper Gen. 4 Color 155mm:Purple - 155mm Each valve has a uniqueIntroducing 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