VFC APFG MPX MP5 Magazine HPA AdapterThe VFC APFG MPX GBB version of the "Sidecar" can use both green gas propane and HPA, as well as building on the existing Black Variable V3 HPA adapters' feature set: AEG magazine sits higher and to the side of the receiver, like an enhanced Redi Mag Shorter overall length height when inserted into GBBR compared to older other adapters Magazine ride height is adjustable Improved gas air seal This can use either green gas or HPA, depending on your