Echo 1 TSA Tactical Sling Adapter for M4 Features: Three hole design for maximum stability and modular option. Full Metal Machine construction. Fits all standard retractable stock. ...
Echo 1 Hop Up For MTC Features and Functions: Model: ECHO SM HOP UP Manufacturer: Bravo Hop Up Unit for Echo 1 MTC AEG Package Includes: 1x Echo 1 Hop Up For MTC