Modular WE-Tech M4 HPA Adapter V3discontinued "Sidecar" builds on the existing Black Variable V3 HPA adapters, which has the following new features: 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 Improvements with Version 3 of our Modular Adapter System include the following: Higher average FPS compared to