First Factory Outer Barrel Base with Battery Block for SIG SAUER MPX Airsoft AEG Rifle

First Factory Outer Barrel Base with Battery Block for SIG SAUER MPX Airsoft AEG Rifle Metal Construction The battery block can also serve as a mock gas block, allowing you to retain the nice looks of the MPX without worrying about the battery wobbling or popping out of the gun, while the barrel base is designed to work with Laylax Outer Barrel Piece for Tokyo Marui M4. Please do note that this product will only work properly with the Laylax Outer Barrel Piece for Tokyo Marui M4 as the battery block that comes in this package will only work with Tokyo Marui M4 spec outer barrel. Suitable For SIG SAUER MPX Electric AEG SMG Rifle Airsoft Guns