SB Tactical SBA4 Stealth Gray 5-Position Adjustable Brace for AR-Platform

The SB Tactical SBA4 Stealth Gray 5-Position Adjustable Brace for AR-Platform gives you a compact, customizable support solution for mil-spec AR builds. Built on the proven design of the SBM4, the SBA4 delivers the adjustability shooters need to dial in the right fit for their stance and body armor configuration—whether you're running drills at the range or setting up a defensive carbine. The adjustable nylon strap lets you fine-tune pressure and control, and the integral ambidextrous QD sling socket means you can mount your sling quickly without aftermarket hardware. Designed and made in the USA, it's a no-nonsense brace built by veterans who understand how working guns actually get used.

If you're building or upgrading an AR pistol or short-barreled rifle on a mil-spec carbine receiver extension, the SBA4 is a direct drop-in—just make sure your upper and lower are already assembled. The five position settings let you dial in length of pull to match your preferred grip angle and shooting style, and the ambidextrous sling attachment means lefties and righties can run their gear the way they want. The stealth gray finish blends with most modern AR aesthetics without drawing attention.

This brace ships with the brace itself and the adjustable nylon strap; your existing receiver extension (carbine buffer tube) stays in place. It's a straightforward upgrade if you're swapping out an older brace or building from scratch on a receiver extension you already own.

Key Features

• 5-position adjustable design for customized length of pull and fit
• Integral ambidextrous QD sling socket—mount your sling without adapters
• Adjustable nylon strap for pressure and retention tuning
• Designed and manufactured in the USA by veteran engineers
• Stealth gray finish
• Compatible with any mil-spec carbine receiver extension

Specifications

Frequently Asked Questions

What receiver extension does this brace fit?

The SBA4 is designed to work with any mil-spec carbine receiver extension (also called a buffer tube). The extension itself is not included—you'll use the one already on your AR lower, or source one separately if you're building from the ground up.

Can I attach a sling without buying an additional QD mount?

Yes. The SBA4 has an integral ambidextrous QD sling socket built in, so you can connect your QD sling hardware directly to the brace without any add-on adapters.

Is the adjustable strap included?

Yes. The package includes the brace and the adjustable nylon strap. No additional hardware is needed beyond your existing receiver extension.

What's the difference between the SBA4 and the earlier SBM4?

The SBA4 is the newer generation, evolved from the SBM4 design. It retains the 5-position adjustability and ambidextrous sling socket that made the SBM4 popular, with further refinements for fit and function.