Samson Carbine Length Drop In Rail System for AR-15 is part of the Samson Tactical Accessory Rail System. The Samson-DI is a drop in rail system that does not require permanent modification to the weapon. At 9.1 oz, the STAR-DI by Samson is a solid addition to any carbine. The Samson Diamond DI is a Drop-In two-piece replacement tactical accessory for your standard M4/CAR15 carbine length handguards. Fits all standard carbine-length AR15/M4 weapons, including 9mm ARs. With slight opening up of the top portion, these will fit Adams Arms and similar gas piston conversions too. Samson Carbine Length Drop-In-Rail System AR-15available models: STAR-DI: Samson Star - Di Rail System AR-15 Carbine Drop-In-Rail System STAR-DI-4: Samson Tactical Accessory Rail System - 4" Drop-In Rail System AR-15 Carbine In addition to the Samson Drop in rail system , we carry a full complement of shooting accessories and rifle scope mounts, rings and bases as well as other product offerings from Samson. We carry a full line of Samson scope mounts and other tactical rails, scope rings, front sights and rear sights. Everything in our online store is backed by the manufacturer's warranty and our own guarantee of 100% satisfaction with your purchase! Specifications for Samson Star-DI and Diamond-DI Carbine Length Drop In Rail System AR-15: Manufacturer: Samson Color: Black Finish: Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: M4, AR-15 Gun Type: Rifle Handguard Type: Drop-In Handguard Style: Quad Rail Gun Rail: Picatinny Gas System Length: Carbine Length Weight: 9.1 oz Condition: New Included Accessories: Standard Quantity: 1 Caliber: .223 Remington, 9mm Luger, 5.56x45mm NATO Hand: Ambidextrous Features of Samson Carbine Length Drop In Rail System for AR-15: No need to remove Delta Ring M203 compatible Package Contents: Samson Carbine Length Drop In Rail System for AR-15