This Heckler & Koch Picatinny Forearm Rail (brand part number 702390) is a factory-original accessory rail section machined from aluminum for the HK SL8 and USC rifles. It installs onto the side of the receiver and adds roughly 4.5 inches of Picatinny rail for mounting a light, laser, or other accessory that needs a solid, repeatable rail interface. Because it’s a genuine HK factory part rather than an aftermarket clone, fitment and finish match the rest of the rifle exactly, and it ships complete with the two mounting screws needed for installation.

Key Specifications

• Purpose-built for the HK SL8 and USC rifles as a factory-original accessory rail.
• Machined from quality aluminum for a durable, precise mounting surface.
• Adds roughly 4.5 inches of usable Picatinny rail space.
• Mounts to the side of the receiver rather than the top rail.
• Includes the two mounting screws needed for installation.
• A genuine factory-original HK part, not an aftermarket reproduction.

Frequently Asked Questions

Which rifles does this rail fit? It’s built specifically for the HK SL8 and USC model rifles.

How much rail space does it add? Roughly 4.5 inches of Picatinny rail for mounting a light, laser, or similar accessory.

Does it come with mounting hardware? Yes, it includes the two mounting screws needed to install it on the receiver.

Buy the HK Aluminum Picatinny Forearm Rail for SL8/USC

Add a genuine factory accessory rail to your SL8 or USC. Order this HK rail, part of our full rifle parts selection, from our Lubbock, Texas gun shop for fast, direct shipping.