JCB Solutions, LLC. Precision Competition, Sporting and Hunting Muzzle Devices Made in the U.S.A.

QR series installation guide.

The QR series brakes are self-timing, quick release brakes are designed to be installed and removed without the need of tools. The self-locking rear compression nut will hold the brake firmly in place with only hand pressure. Removal is the same process in reverse. The QR series is especially beneficial when frequent removal of your muzzle brake is required such as with suppressor mounting.  You can switch back and forth with your direct thread suppressor on the fly, in the field, with no special tools.  The QR series stays together as a single unit so there are no small or multiple parts to keep track of.  Just stow and go.

Step 1.  Twist rear locking nut onto the brake finger tight until it seats lightly and fully onto the brake.

Step 2.  Thread the brake onto the barrel until it makes light contact with the barrel.

Step 3.  Unscrew the brake and locking nut as a unit until you reach proper clocking of the ports.

   (Generally, this will be less than one revolution. Due to different barrel manufacturer barrel clocking, your results may vary.) 

Step 4.  Hold the brake section firmly once in proper timed position.

Step 5.  Un-thread the nut section toward the barrel until it is seated against the barrel and tighten down hand tight.

Step 6.  Double check port alignment, repeat steps 3-5 if position adjustment is needed.

The installation is now complete.  To uninstall, simply twist the locking nut towards the brake end away from the barrel until it makes light contact with the brake section.  Un-screw the brake from the firearm. The brake and nut will come off as a complete unit.

Do not use tools or rods to tighten or loosen the brake thru the muzzle brake ports.  There should never be a need for it. You can potentially damage the finish on the brake.  The brake will remain firmly in place with only firm, hand tight pressure.  If for some reason the brake gets excessively tightened down, or you wish to give it a bit of extra tightening down, use standard flat jawed, adjustable crescent wrenches on the flats on the brake and rear nut section for best results.

  General maintenance is always a good idea by adding a drop of oil to the threads of both sections periodically to keep everything running correctly.  Oil is only needed if you notice the threads are dry.  The brake comes delivered with a light coating of oil on the threads and should last for dozens of switch outs before any fresh oil will be potentially needed.