AimSports Mossberg 500 Forend Black. The AIM Sports MOSSBERG 500 Forend is made of polymer with aluminum side rails and requires no gunsmithing for installation. Specifications for AIM Sports Mossberg 500 Forend: Length: 8" Weight: 9 oz. Features of AIM Sports Mossberg 500 Forend: Polymer body with black anodized aircraft grade aluminum rails Accepts all standard Weaver / Picatinny 1913 accessories No gunsmithing required Compatible with Mossberg 500 Package Contents: AIM Sports Inc Mossberg 500 Forend What firearm models does the manufacturer say AIM Sports Mossberg 500 Forend w/ Side Rails is compatible with? The manufacturer says that AIM Sports Mossberg 500 Forend w/ Side Rails is compatible with Mossberg Model 500AIM Sports Inc MFE500: Mossberg 500 Forend Black