The Armaspec ARCA Rail (brand part no. ARM621-9) is a 9-inch black rail built to integrate directly with M-LOK handguards, giving precision rifle shooters a longer attachment surface for mounting to an ARCA-Swiss compatible tripod head or clamp. Armaspec machines it to bolt flush along the handguard without adding a bulky separate rail system, keeping the rifle’s profile clean while offering the extended ARCA interface competitive PRS and long-range shooters rely on for repositioning the tripod clamp along the handguard. It’s a straightforward way to add extended tripod compatibility to an existing M-LOK-equipped rifle build.

Key Specifications

• Measures 9 inches, Armaspec’s longer ARCA rail option for extended clamp positioning.
• Uses an ARCA rail interface that integrates directly with M-LOK handguards.
• Finished in black to match standard AR-pattern rifle furniture.
• Purpose-built for tripod-mounted precision shooting, giving fast attachment to ARCA-Swiss clamps.
• Measures 0.55 in. in height for a low-profile rail cross-section.
• Measures 2.50 in. in width, matching Armaspec’s ARCA rail profile.
• Bolts flush along the handguard rather than adding a separate bulky rail.

Frequently Asked Questions

Does this require a separate rail system? No, it integrates directly with an existing M-LOK handguard.

Why choose the 9-inch length over the 6-inch? The longer rail gives more room to reposition the tripod clamp along the handguard for balance.

What is an ARCA rail used for? It lets the rifle attach quickly and securely to an ARCA-Swiss compatible tripod head or clamp.

Find more precision rifle accessories in our other rifle accessories & parts category from Armaspec.

Buy the Armaspec 9-Inch ARCA Rail, Black

A longer ARCA rail gives a precision rifle more balance points on a tripod clamp, useful when shifting from prone to a barricade position. Order it from our Lubbock, Texas gun shop for fast, direct shipping.