Barrel Shim Kit 1/2x28 Muzzle Brake Alignment 16 Pieces

Was as described

They are all the same OD/ID but the thickness is different, which is what you buy this kit for. I have not checked the thickness with a caliper because I only needed a thick one for now. There are many that are paper thin all the way up to 1/4 the thickness of a dime just for reeference.

Good quality shims, better than others on Amazon but I do wish it had more small sizes.

It took me like two minutes to sort these by simply weighing them. Two of each size. Since they are all the same diameter, the weight is in direct proportion to the thickness. Easy peezy. Of course, you'll need a sensitive balance to weigh them -- which you'll have if you reload. Then it took maybe one more minute to find the shim that got me to within a 1/4 turn of correct timing. With the crush washer installed I had plenty of range at almost the same 20-30 ft-lbs. Once I had it close, I used the torque wrench for the final alignment. Done. As others have said, these were a little larger than my barrel -- but not bigger than my muzzle device, so they worked fine. I docked one star for the size.

If you're looking for an easier way to index your muzzle device so it threads on the muzzle in a particular way (say, putting an A2 flash hider on so the slots are on the top of the barrel, rather than the bottom), then using these shims are the way to go, as opposed to using a crush washer. These shims allow for closer engagement before locking down the device with a wrench, and I'm told are a better solution than a crush washer if you plan on using aftermarket silencers. Evidently, crush washers can distribute pressurized gasses unevenly, which isn't really an issue until you put a can on the other side of the muzzle. Don't go by me, but do your own research if you're interested.While I do like these better than crush washers, these aren't marked (mine weren't, anyway), so you'll need a few minutes of trial and error to get things like you'll like 'em. It took me a solid 15 minutes (don't laugh, I'm old) to find the right combo of shims to index my flash hider correctly, but once I did, I could torque it down without fear of overtorquing my crush washer and ruining it. Perfect fit for 1/2 x28 tpi muzzles. Plus, when you're done, you've got some spares. Recommended.

Great range of thicknesses. Consistent radial thickness, stated concentric to the bore when I used several to get the timing perfect. After thousands of rounds still nice and torqued, did not deform after final torque. Perfect solution, easy to order, can't figure out why LGS don't keep these in stock. No matter, easy peasy from Amazon in two days.

I first bought another set with all of them being divisible by 2 (even numbered sizes). No matter how I tried, I was always just a little off center with my brake. Most people probably wouldn't have even noticed it, but things like this drive me absolutely nuts! Thankfully, they are pretty cheap, so I started looking around more and found these. The numbers (sizes) are all over the place (both odd and even sizes), so I figured I'd be able to find the right combination. No combination needed. The very first one I tried tuned the brake perfectly. I didn't even use a caliper. I just dumped them all out on the floor, picked one up and said, "This looks like it'll work." Call it luck if you like. NO, says I. I'm just that good.If I had one complaint it would be about the color. Yes, since I only had to use one, it's not really noticeable. The last set I bought were black and these are a grayish silver. My barrel and brake are flat black. Again, not a deal breaker and I'd prefer that over one that didn't align everything perfectly. I'm just saying it would have been nice if they'd offered this same set in black.

I have a lot of experience timing muzzle devices. I normally use YHM shim kits, but figured I'd try these for a duplicate rifle build (two rifles, same barrels and muzzle devices). The clocking without shims was off by 380 degrees (a little over one thread) between barrels. After 20min of trying to eyeball the shims, and unsuccessfully trying 20+ times, I decided I needed to measure and mark the shims, via rotation range. After 30min, I had them all marked; 10 different thicknesses (good luck using a digital micrometer!). I laid them all out, thick to thin (see photo), then got to work. First rifle took 10min to get to -15 degrees. That should clock about -5 degrees, once tightened. Second one took 5min, resulting in 0 degrees, which should be +5 degrees once lightly tightened. I'll be using Rockset (HotLock...Sodium Silicate) to lock these into place, then I'll be pinning and welding the 13.7" barrels to make them Non-NFA for rifle use. These would have been much easier to find the proper combination of shims if they were marked. I'd suggest marking their sizes before trying to find the perfect clocking (-5 to -10 degrees, if using lubrication, prior to tightening.) The manufacture would make these much easier to use if they marked or dyed the different sizes, since there are so many sizes. I'll order them again, but I'll definitely measure them all first!