Diamondhead V-RS (Versa Rail System) 7 Drop-In Versa Base Diamondheads V-RS Modular Drop-In Handguard platform offers fore-end versatility for the M4 like never before. With lightning fast installation and almost limitless configurations for accessories, the V-RS sets a new standard for drop-in rail systems. The V-RS 7 Versa Base is offered standard on the STAG Arms Model 3. Features:- 7 V-RS Base- Customize the V-RS for specific applications- Mix full length & short rails with bumpers - Add more rails as additional accessories are needed- Fast configuration changes- Mil. Std. 1913 Picatinny rail dimensions - Mil. Spec. Type III anodized 6061 ?T6 aluminum construction - Combat durable Fits: ll M4/AR15/M16 Variants