JE Machine Tech AR15 Receiver Extension Pistol Buffer Tube w/o Foam Black. AR15 RECEIVER EXTENSION PISTOL BUFFER TUBE NO FOAM Specifications for JE Machine Tech AR15 Receiver Extension No Foam Pistol Buffer Tube: Manufacturer: JE Machine Tech Color: Black Finish: Anodized Fabric/Material: Constructed from Grade T7075 Aluminum Length: 7 3/8 Condition: New Features of JE Machine Tech AR15 Receiver Extension No Foam Pistol Buffer Tube Platform: AR15 / AR308 Constructed from Grade T7075 Aluminum Black Anodized finish Fits any standard Mil-Spec AR15 lower receivers Package Contents: JE Machine Tech AR15 Receiver Extension No Foam Pistol Buffer Tube JE Machine Tech PS-BTP-NF: AR15 Receiver Extension Pistol Buffer Tube w/o Foam Black