MIT Airsoft posted a video showing upcoming accessories that you can use on the SIG Air M17 Gas Blowback Pistol. These are a RMR mount base, Rear Sight Pad with Cocking Handle. The SIG Air M17 GBB pistol has VFC as OEM and it may also fit the the Asia Electric Guns F17 which is the unlicenced version that was originally developed by WE Airsoft... "New Innovation, new tactical accessories are coming soon. This time we do it for the Sig Air M17 GBB Pistol, stay tuned!"