Jeff@GrizzlyGunworks.com

Tel. (226) 208-1200

If you have NO front sight and magazine tube please provide:


(A)  Muzzle Diameter (e.g. 0.753 inches)
(B)  Barrel Diameter 1 inch from the muzzle (e.g. 0.762 inches)


If you have a FRONT SIGHT please provide:


(A)  Muzzle Diameter (e.g. 0.753 inches)
(B)  Barrel Diameter 1 inch from the muzzle (e.g. 0.762 inches)
(C)  Width of front sight
(D)  Distance from muzzle to front sight


If you have a MAGAZINE TUBE please provide:


(A)  Muzzle Diameter (e.g. 0.753 inches)
(B)  Barrel Diameter 1 inch from the muzzle (e.g. 0.762 inches)
(E)  Distance between barrel and magazine tube


If you have a FRONT SIGHT and a MAGAZINE TUBE please provide:


(A)  Muzzle Diameter (e.g. 0.753 inches)
(B)  Barrel Diameter 1 inch from the muzzle (e.g. 0.762 inches)
(C)  Width of front sight
(D)  Distance from muzzle to front sight
(E)  Distance between barrel and magazine tube

How to get the perfect Muzzle Brake fit for your Shotgun? 


A few things to consider before you measure your shotgun barrel:

1.  A shotgun barrel in most instances will be non-threaded (meaning there is no screw like threads at the end of the barrel).  If your shotgun barrel is non-threaded please follow the instructions below to measure your barrel.  If your shotgun is non-threaded you have a choice of purchasing a CLAMP-ON Muzzle Brake (no additional gunsmithing cost to thread your barrel) -- OR --  a THREADED Muzzle Brake.  If you decide to go the Threaded Muzzle Brake route you will need to have the end of your barrel threaded by Grizzly Gunworks or a qualified gunsmith (this will cost you between $100 - $160).  Please note Grizzly Gunworks will thread barrels for Canadian customers only.  **Please note, if your barrel has a front sight, your muzzle cannot be threaded.**

Grizzly Gunworks has developed and patented the CLAMP-ON muzzle brake technology to save you money.  We are the only manufacturer of muzzle brakes in the world that properly provides the clamp-on technology for shotguns.  We are, also, by far superior in quality and performance to our competitors.  If you are wondering what are the performance benefits of getting your muzzle threaded, there are none, it is only personal preference.  Our clamp-on muzzle brake technology is superior, hence, it delivers equal performance to threaded muzzle brakes. 

2.  If your shotgun has a front sight, and/or, a magazine tube within 1 INCH OF THE MUZZLE; please pay attention to the diagrams below as they will instruct you how to correctly provide your measurements.

3.  If your shotgun is threaded it will not have a front sight and/or a magazine tube; go directly to our online store and order by entering your threads.  If you do not know your threads give us a call tel. 226.208.1200 or email Jeff@GrizzlyGunworks.com.

4.  You MUST use calipers -- OR -- a micrometer to take your measurements to 3 decimal places (e.g. 0.856 inches).  Everything we produce is going to fit your barrel like a glove hence accurate measurements are required.  Your muzzle brake is custom made to your barrel's unique specifications.

Quick Tip -- You can buy a micrometer or calipers by clicking the links below.  This is only a suggestion and it is up to you where you want to buy these measuring tools. 


Click here to Purchase Calipers from HARBOR FREIGHT TOOLS

Click here to Purchase a Micrometer from HARBOR FREIGHT TOOLS


5.  We DO NOT offer refunds on custom work, please take extra care and triple check your measurements.  Your muzzle brake is made to your specific measurements hence it cannot be re-sold.

We need your barrel specifications to ensure the perfect muzzle brake fit on your shotgun.  


Follow these instructions to measure your NON-THREADED SHOTGUN barrel:


SHOTGUN BARRELS