Sig Sauer Pivoting Contour Brace, Model 8901672, Compatible with MCX/MPX, 1913 Interface, Black

The Sig Sauer Pivoting Contour Brace (Model 8901672) is a factory brace designed specifically for MCX and MPX platforms that attach via 1913 interface. If you run either of these compact, modular Sig rifles, this brace transforms your shooting setup by enabling a stable, repeatable cheek weld and shouldering position—critical for precision work whether you're running drills at the range, hunting, or testing your accuracy at distance. The pivoting design lets you fold it down when you need a compact carry profile, then deploy it when you're ready to shoot.

The brace ships with an included forearm strap that anchors it securely to your body, steadying the gun during strings of fire and reducing fatigue in longer shooting sessions. The locking hinge mechanism is the real detail here: it holds the brace firmly in place whether you're extended and ready to shoot or folded back against the receiver, eliminating any unwanted rocking or movement that could compromise accuracy or consistency.

Installation is straightforward—it mounts directly to your MCX or MPX's existing 1913 interface without requiring modifications or adapters. The all-black finish matches modern Sig factory furniture and doesn't add visual weight to your setup. Whether you're building a dedicated range gun, a hunting rifle, or just want to unlock the potential of your MCX/MPX, this is a no-nonsense upgrade that actually improves your ability to shoot well.

Key Features

• Factory Sig Sauer design engineered for MCX and MPX compatibility
• Pivoting design folds for compact carry, deploys for stable shooting
• Locking hinge prevents movement when deployed or folded
• Includes integrated forearm strap for added stability and control
• Direct 1913 interface installation—no adapters needed
• Black anodized finish

Specifications

Frequently Asked Questions

Will this brace fit my MCX or MPX?

Yes—this brace is designed specifically for Sig MCX and MPX rifles and mounts directly to the 1913 interface on those receivers. No adapters or modifications are required.

What comes in the box?

The brace itself and an integrated forearm strap designed to anchor the brace against your body for added stability and support during shooting.

Can I fold this brace up when I'm not shooting?

Yes. The pivoting design allows you to fold the brace back against the receiver for a more compact profile. A locking hinge mechanism secures it in place so it won't swing loose during transport or handling.

What's the difference between this brace and just shouldering the gun?

This brace provides a rigid, repeatable contact point for your cheek and shoulder, enabling consistent sight picture and improved accuracy. The included forearm strap adds stability that reduces shooter fatigue in longer sessions and helps control recoil during rapid fire.