Warne Atlas ARCA Rail Adapter Black. The Four Sided Rail Extension Has Four Standard ARCA Slots For Mounting A Wide Variety Of Accessories Such As Lights Laser Sights Or Bipods. This Handguard Has Four Standard ARCA Pivot Pin Slots That Allows The User To Install A Standard Arca Picatinny Rail Onto The Full Flattop Version Of The Rail Extension And The Standard ARCA Clamp Has Four Standard ARCA Clamps For Perfect Coupling With A Standard Atlas Rail. If You Want To Add Additional Lights Or An AR Carbine To Your Weapon This Is The Very Last Addition To Your Arsenal. Enhance The Quality Of Your Build By Adding This Warne Rail Adapter. Specifications for Warne Atlas ARCA Rail Adapter: Manufacturer: Warne Color: Black Fabric/Material: 6061-T6 Aluminum Additional Features: Arca Condition: New Package Contents: Warne Atlas ARCA Rail Adapter Warne 7955M: Atlas ARCA Rail Adapter Black