Yankee Hill Machine Barrel Shim Set Stainless, 5/8" Diameter

Getting a muzzle device to time correctly is one of those details that separates a solid build from one that runs flawlessly. The Yankee Hill Machine Stainless Barrel Shim Set is a precision timing tool designed to dial in your muzzle brake or suppressor to the exact orientation you need. Built in stainless steel with a 5/8" inner diameter, this shim set works with Yankee Hill Machine's 30 CLS Q.D. muzzle devices to ensure your brake sits exactly where it should on the barrel.

Proper timing matters. A muzzle device that's even slightly misaligned can throw off blast direction, recoil management, or suppressor indexing. Rather than grinding, filing, or hoping for the best, these shims let you make precise adjustments in known increments. That's the kind of engineering that builders and gunsmiths rely on when the details count.

This kit includes a selection of thicknesses so you can find the right combination for your setup: two 0.002" shims for fine-tuning, five 0.005" shims for moderate adjustments, and one 0.020" shim for larger gaps. Stainless construction means they'll hold up to repeated assembly and disassembly without deforming or corroding.

What's Included

• 2× 0.002" stainless steel shims
• 5× 0.005" stainless steel shims
• 1× 0.020" stainless steel shim

Specifications

Frequently Asked Questions

What muzzle devices are these shims compatible with?

This shim set is designed for use with Yankee Hill Machine 30 CLS Q.D. muzzle brakes and works with barrels having a 5/8" diameter at the muzzle.

Why would I need barrel shims for my muzzle device?

Shims allow you to fine-tune the rotational timing of your muzzle device so it points in the exact direction you want. This ensures optimal blast control, recoil direction, and suppressor indexing if you plan to run a can.

How do I know which shim thickness to use?

You'll stack shims in whatever combination gets your muzzle device to the desired position. The kit includes multiple thicknesses—0.002", 0.005", and 0.020"—so you can add or subtract thickness as needed to dial in perfect timing.

Are these shims reusable?

Yes. Because they're made from stainless steel, these shims can be removed and reinstalled multiple times without losing their integrity or thickness.