Area 419 Arcalock 4 in Universal Flat Rail Black. Area 419 created this Picatinny Rails with a mechanical lock that prevents your accessories from sliding when in place. The Area 419 ArcaLock 4in Precision Rifle Rail is crafted from indestructible lightweight aluminum that resists corrosion and wear. Having this on your weapon will make it much more precise and accurate. The Area 419 ArcaLock 4in Aluminum Flat Rail will fit any existing ARCA rail making it incredibly versatile for attachment of tools lasers and other accessories. The rail is also easy to install on your own. Pick up the Area 419 ArcaLock 4in Rail today to get your weapon looking sleek with a perfectly attached scope. For all those looking for the lightest smallest ARCALOCK rail on the market here ya go. Weighing in at just 1.5oz this will fir forend hole spacings of 2 -3.5 just like our extremely popular IBR. The rail will also come with t-nuts and hardware to allow you to install the rail closer to the magwell for tripod use. MLOK HARDWARE NOT INCLUDED Specifications for Area 419 Arcalock 4 in Universal Flat Rail: Manufacturer: Area 419 Color: Black Fabric/Material: Aluminum Hand: Ambidextrous Gun Type: Rifle Gun Make: Universal Gun Model: Universal Length: 4.25 in Width: 1.5 in Height: 0.5 in Weight: 1.5 oz Condition: New Country of Origin: USA Package Contents: Area 419 Arcalock 4 in Universal Flat Rail Area 419 419-ALK-UNIV4RAIL: Arcalock 4 in Universal Flat Rail Black