5KU AK Rear Sight Rail Mount for AK AEG/ GBB Airsoft

5KU AK Rear Sight Rail Mount for AK AEG/ GBB Airsoft Metal Construction 20mm PIcatinny Rail System With the Build-in Rear Sight on the Rail Suitable For AK Series Airsoft Electric Gun AEG Rifle/ GBB Gas Blow Back GBB Rifle Airsoft Guns