These are $85 on evike Matrix Swordfish Conversion Kit for MP5 Series Airsoft AEG Rifles High Strength Full metal / Aluminum Construction Provides a bridge for the entire rifle to prevent wobbling. Gives your MP5 an Aggressive Look & Feel Kit includes all necessary hardware for top rail and front end conversion. Works with MP5 A4 / A5 and similar series Airsoft rifles Compatibility: For Tokyo Marui, JG, CYMA, Echo1, H&K, Umarex, SRC, ICS, Classic Army, G&G MP5 and compatible series Airsoft AEGs Manufacturer: Matrix