POWER CUSTOM - Upper/Lower Receiver Shims

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.