Deadair Da004 Muzzle Device Shim Kit M18

The Dead Air Armament DA004 Muzzle Device Shim Kit is an essential tuning tool for shooters running suppressors on host guns with non-standard barrel threads. This shim kit lets you fine-tune the timing and alignment of your muzzle brake or suppressor mount, ensuring optimal concentricity and performance. Whether you're building a precision rifle, setting up a new suppressed host, or troubleshooting an existing setup, having the right shims on hand makes the difference between a job done right and a frustrating return trip to the bench.

The DA004 kit includes three different shim thicknesses, each designed to dial in your muzzle device on barrels threaded to either 1/2-28 or 5/8-24 specifications. The packaging itself serves as your reference guide, graphically detailing each shim's thickness and how to identify them. Installation is straightforward: stack your shims on the barrel threads, beginning with the thickest shim first, then work your muzzle device or suppressor mount down the stack. This layering approach gives you repeatable, measured adjustments without guesswork.

If you're serious about suppressor setup, concentricity, or muzzle device alignment, keeping a shim kit in your reloading room or gunsmith bench is the smart move. Dead Air's engineering and quality control mean you're getting precision shims, not improvised spacers. It's the kind of small accessory that separates clean, professional builds from ones that leave you scratching your head wondering why things don't feel quite right.

Key Features

• Three different shim thicknesses for precise muzzle device or suppressor mount tuning
• Compatible with 1/2-28 and 5/8-24 barrel threads
• Graphical identification on packaging for easy reference during installation
• Engineered by Dead Air Armament for precision fit and repeatability

Specifications

Frequently Asked Questions

What barrel threads does this shim kit fit?

The DA004 is designed for barrels with 1/2-28 or 5/8-24 threads, the most common specifications for rifle suppressors and muzzle devices.

How do I install the shims?

Stack the shims on your barrel threads, placing the thickest shim first, then work your muzzle device or suppressor mount down the stack. The packaging includes a graphic showing each shim's thickness and identifying features to help you choose the correct stack for your setup.

What is this kit used for?

Shims fine-tune the alignment and timing of muzzle brakes and suppressor mounts on your barrel threads, ensuring concentricity and proper fit between the muzzle device and host gun.

How many shims are included?

The kit contains three different shim thicknesses, providing multiple tuning options for different barrel and muzzle device combinations.