The Dead Air Muzzle Device Shim Kit in M18 (brand part no. DA004) is the shim set for M18 metric muzzle threads. It is made of three different shim thicknesses so a brake or flash hider can be timed precisely to the barrel. Dead Air prints a graphic on the packaging that shows each thickness and how to identify it. Metric-threaded precision rifles are the usual home for this kit.

Key Specifications

• The kit is made for M18 threads, the metric size in Dead Air’s shim kit line.
• It contains three different shim thicknesses, giving fine control over timing.
• The purpose is precise timing of your muzzle device, indexing it to the correct position.
• The thickest shim goes on the barrel shoulder first, per Dead Air’s instructions.
• The packaging graphic shows the thicknesses and identifying features of the shims.

Frequently Asked Questions

Which thread does this kit fit? This is the M18 kit. Dead Air also lists shim kits for 1/2-28, 5/8-24 and 3/4-24.

Which shim goes on first? Dead Air says to always place the thickest shim on the barrel shoulder first.

What does the kit do? It lets you time a muzzle device precisely by combining shims of three different thicknesses.

Buy the Dead Air Muzzle Device Shim Kit, M18

Metric muzzle devices need accurate timing as much as any other, and a proper kit makes it a quick job. Add it to your order of Class 3 parts and accessories from our Lubbock, Texas gun shop for fast, direct shipping.