My first time to see a rail system from Surefire. This one's available at OPSGEAR for US$211.99. Check first if your AEG can handle real steel accessories before getting one... "The M73 Picatinny rail forend from SureFire, the tactical technology company, is a high-quality Picatinny forend for the AR/M4-type carbines that replaces the weapon's stock forend allowing the user to mount a variety of accessories.

Machined from military specification hard-anodized aluminum, they're stronger, dissipate heat much better,and provide rock-solid weapon fit. These precision rails enable consistent 'repeat zero' of any accurately dimensioned devices attached to them, such as SureFire lasers or WeaponLights."