The Armaspec 3-Inch ARCA Rail (brand part no. ARM621-3) adds an Arca-style interface to a firearm with an M-LOK handguard. That gives you a stable, adjustable foundation for bipods and other shooting accessories that use Arca-style mounts. At 3 inches long it weighs only 0.7 ounces, and Armaspec machines it from 6061-T6 aluminum in the USA. It is a practical way to put a tripod-ready rail on an AR-15 handguard or a bolt gun chassis without adding noticeable weight.

Key Specifications

• The interface is Arca-style, compatible with Arca rail accessories such as bipods.
• It attaches to M-LOK slots, so it bolts directly to an M-LOK handguard.
• The length is 3 inches, a short rail for a single accessory.
• The weight is 0.7 ounces, light enough to leave on the rifle.
• The material is 6061-T6 aluminum, a strong and light machining alloy.
• The finish is Mil-Spec Type III hard coat anodize, which resists wear.
• It is compatible with AR-15/10 M-LOK rails.
• It also fits various bolt gun chassis with M-LOK slots.
• It is made in the U.S.A. by Armaspec.
• Armaspec backs it with a lifetime warranty.

Frequently Asked Questions

What does an ARCA rail do? It adds an Arca-style interface so you can mount bipods and other accessories that use Arca-style mounts to your M-LOK handguard, with stable attachment and quick adjustment.

What does it mount to? It mounts to M-LOK rails, including AR-15/10 M-LOK handguards and various bolt gun chassis.

How much does it weigh? The 3-inch rail weighs 0.7 ounces.

Buy the Armaspec 3-Inch ARCA Rail

Arca-style mounting makes a rifle a quick, adjustable platform for bipods and similar accessories. This 3-inch rail from Armaspec is a light and tough way to add it to an M-LOK handguard. Order it from our Lubbock, Texas gun shop for fast, direct shipping, and see more rifle accessories and parts while you are here.