AIM Sports Inc AR-15/M4 Handguard/Quad Rail Carbine Length Black Medium. These AR Handguards & Forends from AIM Sports Inc have Picatinny/Weaver compatible rails on all 4 sides to give you room to install optics lights a vertical grip and more. The AIM Sports Carbine Length Handguard/Quad is easy to install and is compatible with most direct impingement gas systems. Add modularity to your build with the AIM Sports AR15/M16/M4 Carbine Length Handguard/Quad Rail. Specifications for AIM Sports Inc AR-15/M4 Handguard/Quad Rail: Manufacturer: AIM Sports Inc Color: Black Finish: Anodized Fabric/Material: Aluminum Gun Make: AR Platform Gun Model: M16 M4 AR-15 Gun Type: Rifle Handguard Length: 6.5 in Handguard Style: Quad Rail Gun Rail: Picatinny Gas System Length: Carbine Length Weight: 16 oz Condition: New Included Accessories: Standard Quantity: 1 Features of AIM Sports Inc AR-15/M4 Handguard/Quad Rail Black anodized aircraft grade aluminum Accepts all standard Weaver / Picatinny 1913 accessories Two-piece drop-in design Compatible with most carbine length direct impingement gas systems No gunsmithing required Package Contents: AIM Sports Inc AR-15/M4 Handguard/Quad Rail AIM Sports Inc MT021: AR-15/M4 Handguard/Quad Rail Carbine Length Black Medium