AR-15/M16 RECEIVER SHIMS Reviews & Ratings

lightly roughed up upper lug sides 400 grit black carborandum sand paper (do not remove anodized finish) use steel backer with s. paper cross hatch sanding, clean with asotone use acro-gel epoxy very thin amount, use tight fitting pins apiece of tubeing to press shims tight to lugs. P.S. apply release agent like car wax on pins to keep pins from sticking!! never had one come off.

Just one shim installed on the front pin of my rifle completely eliminated small wiggle between the upper and lower making the rifle feeling very solid. The only disadvantage is that it is a little tricky to install it.

Building a precision Ar-15, when fitting the upper to lower it was loose. Read everything available on the net about this problem. Decided to use an Accu Wedge on the rear, which worked well by itself but didn't give me the results I wanted, so I ordered the shims. I used one on the front and the results were exactly what I wanted, rifle was solid. Fitting was a bit tough at first, I tried every location on the front lug until I found the best position that was easiest to install and remove. Used a small hammer to position it (upper and lower in position) and a punch to center the shim on outside of right forward upper receiver lug with a lot of lube. When installed it is good to go, took it apart a couple times to check ease of installation. It is something that takes a bit of work to assemble and disassemble but it works and all parts are easy and cheap to replace to get the desired results. Shim and Accu-wedge that's the ticket.

I bought this product after seeing it in learning section of the website. I am currently a full time police officer/firearms instructor and have wasted thousands of dollars on gimmicks and other bs products that claim to get rid of every problem you have with your rifle. At my department we are all assigned an individual m4 carbine that is ours. We are also allowed to make slight modifications within reason and this is only on the ouside not internally in the gun. Ive been assigned the same m4 for ten years now and have tens of thousands of rounds through it from training, personal training, attending brass maker carbine classes, and annual qualifications. My point, my rifle has some wear and tear on it. It is a bushmaster (old school rifle actually made in the Windham, Maine plant before Freedom group bought them out.) This was a $600 rifle when I bought it. Its not a $2,000 rifle. It has gone the distance and then some and rarely, I mean rarely had a malfunction which has been due to ammo everytime. So from this wear and tear Ive never had to replace buffer springs, gas tubes, etc. Ive only cleaned it and stayed up on it. However this brings to me to my point. My upper and lower have considerbale play in them. There's some slop. I tried the accuwedge from Brownells which did do a good job of getting rid of the rear slop however I still had front slop. I tried the accuwedge in another rifle build I have which got rid of all the slop. The rifle I built was brand new and didn't have any of the wear and tear on it my duty rifle did. So at first I tried one shim on both take down and pivot pins. Didn't take all of the slop out but most of it. So I then tried two shims on each pin. It was so tight I couldnt lock the upper and lower together. After some quick research I ended up going with an accuwedge in the rear by the buffer and two shims on the pivot pin. Worked like a charm. Rifle feels brand new. It doesn't move like a cerokoted rifle. Again, my rifle doesn't move at all. There is zero slop. This was done all for the cost of the $20. Brownells accuwedge is a great addition to any rifle. Get it along with the shims. You wont be sorry. Also becareful of reviews. Some people aren't intelligent enough to actually be assembling these rifles. i WOULD RECCOMEND THIS TO A FRIEND AND EVERYONE. HERES A HINT BROWNELLS. YOU SHOULD SELL YOUR ACCUWEDGE WITH THE RECIEVER SHIMS AS PART OF A PACK DEAL.

These shims are the best fix for receiver wobble. No need to "accu-wedge" or o-ring your upper. This will make it solid and they are discreet. Buy with confidence. Fix the pesky wobble.

So they def work, I used a wedge as well and it’s as good as it’s going to get! Brand new Colt 6940. This is my second Colt rifle. First one is 25 years old LE tactical, and there is zero play in between the receivers. Not sure when this rifle was manufactured, have a friend that purchased one out of same lot that is exactly like mine. CZ QC must be poor. Anyway these shims are brutally expensive for what you’re getting. I could only get one in, 30 bucks for a tiny washer is excessive !! I found it easier to vice the rifle in a mag block as upside down as I could get it and work the shim in between upper and lower with it mostly closed. Again absolutely works just way too much money for what you’re getting.

Product works well. Wish they provided various thickness shims not just one size. I had to put 2 on one side and 1 on the other, would of been better if I could of been able to shim evenly to center it. I do recommend though.

This is not a workable solution for receiver slop in my opinion. It is easy enough to install a single shim, but when stacking multiple shims at once is nearly impossible to close the pivot pin. (In my case, a single shim did not produce a noticeable improvement). If one shim just happens to be the goldilocks size to make your receiver fit tight then great. Otherwise, this seems like a massive waste of time and money. The kit is hugely over-priced in my opinion. This should be a $10 or $20 item (e.g. $1-2 per shim, not $3.50 each). Major ripoff for something that does not really deliver on function. Save your money and buy lower receivers with tensioning screws instead (e.g. Aero Precision, Mega, Ballistic Advantage, or similar). Tensioning screws solve the receiver-slop problem the best in my opinion.

I found these shims difficult to install. Because they do not come in varying thickness, I required more than one. However, I could only get one easily installed. There was still enough play that I wanted to add another, but I needed a thinner one and could not get a second installed. Furthermore, they are a pain to get lined up. Don't get me wrong, it's doable, but I wrecked a couple of them trying to get it lined up correctly. I returned the item because it ended up not being helpful. Most shim kits come with various thickness shim disks. At this price point, I was shocked to find these were just 10 of the same.

The Q&A section answer from a Brownells expert said yes they will fit an AR10 take down pin. Well, They do NOT folks! Plus the price is very high for what you receive. 10 shims of an unknown thickness for $28. My suggestion is to keep looking, better deals with better specifications elsewhere.