Diamondhead Short Rail Kit (3Pk) for V-RS Drop-In Handguard 2831 Short Rail Kit (Set of 3 rails) for Diamondhead V-RS (Versa-Rail System) Modular Drop-In Handguard. Rail length: 2 5/8" (5 slots) Combat durable Customize the V-RS for specific applications Mil. Std. 1913 Picatinny rail dimensions. Fits all .223 variants