In this case, we need our shims to add a total thickness of. I round this number down to the nearest thousandth (X.XXX). This 0.002″ accounts for any crush you might get when torquing the muzzle device. Timing a Dead Air flash hider using five of the supplied shims. For my example, the fractional rotation will be 11/12, 0.9166 in decimal form. Once again, these clock positions are referenced from in front of the muzzle. When going back clock positions, say from 9 to 6 o’clock, leave the number as is. When going forward a clock position, subtract that number from 12. One clock position is 1/12 of a fractional rotation. My muzzle device needs to go one clock position forward from 5 to 6 o’clock. Install your muzzle device and make it hand-tight. These clock positions are referenced by looking at the muzzle from the front of the firearm. I find it easiest to use clock positions as everyone is familiar with them. B = Fractional Rotation = 11 / 12 = 0.9166ī – Calculate this as a fraction of the amount of rotation you want the muzzle device to make. For this example, my 5.56 AR-15 has a 1/2-28 thread or 28 TPI. Find the TPI using a thread pitch gauge or look up the manufacturer’s specs. A = 1 / TPI= 1 / 28 = 0.0357Ī – Is one divided by the threads per inch(TPI) of your muzzle. I’ll break it down into three parts to simplify it even further. I did the math, and sure enough, it worked! (A x B) + 0.002 = C In this case, you are adding material instead of removing it. After some thought, I realized it is the same formula as timing a screw, just in reverse. It took screwing and unscrewing my flash hider three times before I thought there had to be a better way. The Easy Formula for Timing a Muzzle Device Use coupon code KTG10 to get 10% off your order of $150 or more at Brownells. This flash hider’s pin and weld hole needs to come one clock position further to be timed properly. While I have not tested that personally, I have no reason not to believe him. In this video, Mike from Dead Air said that going past 50 ft/lbs of torque can negatively affect accuracy. Dead Air recommends between 25-35 ft/lbs of torque. When in doubt, follow your manufacturer’s specifications. How Much Torque when Timing a Muzzle Device? Adding a six-inch suppressor to a misaligned muzzle device is asking for problems. The same is not true with crush washers, as they can cause alignment issues. Shims are an even thickness and keep the muzzle device true to the threads on the barrel. If you plan on using a suppressor, do not use crush washers, use shims. That is completely ok to do if you are not going to run a suppressor. Most factory AR-15s come with a standard flash hider, or muzzle brake timed using a crush washer. A crush washer(Left) should not be used when a suppressor will be mounted. They are designed to direct the gases that exit your muzzle in different directions to tame muzzle climb and reduce recoil. On the other hand, muzzle brakes need to be timed. Even though I don’t need to pin and weld this on my barrel, that is still an excellent place to position it aesthetically. On the Dead Air Keymount Flash Hider, a pin and weld hole is meant to be positioned at 6 o’clock on the barrel. Many flash hiders, including the one I am using, don’t require timing. Timing a muzzle device is not always necessary. Using the simple formula below, you will have the correct amount of shims the second time you install the muzzle device on the barrel. Timing a muzzle device can be an absolute pain.
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