5KU Metal M4 Stock Adapter For SIG Sauer MCX / MPX AEG

5KU Metal M4 Stock Adapter For SIG Sauer MCX / MPX AEG Metal Construction Fit to Mount on 20mm Picatinny Rail Able to Mount Standard M4 AEG Buffer Stock Tubes Suitable For SIG AIR MCX Electric AEG Rifle Airsoft Guns Also Fit for SIG AIR MPX Airsoft Electric Gun AEG Rifle