Samson Modular Accessory Tactical Rail for the AR-15 M4. The one piece unit has a bolt on design that requires no modification to your rifle. With its unique bolt on design it will fit snugly into the recesses of most handguards. This Samson Mount & Base requires no permanent modification to your weapon. Bolt it on adjust any nuts and bolts and begin to customize Single hand actuation screws & bolt nuts ensure that this Samson Mount & Base will stay put. Features: Lightweight durable stainless steel easy to install corrosion and damage resistant black powder coated for durability Samson limited lifetime warranty. Specifications for Samson Modular Accessory Tactical Rail for the AR-15 M4: Gun Model: AR15 Samson Modular Accessory Tactical Rail for the AR-15 M4