WheelerDelta Series Rifle Complete Brush Set

Excellent tool for truing up the front of the upper receiver before barrel installation. Easy to use and only takes a few minutes to true up the receiver. I was skeptical at first about this making a difference but, not anymore. I had a rifle that wasn't accurate to suit me. Took the gun apart and trued the receiver and back together for a test. Wow, what a difference in accuracy. From a 2.5 to 3" group at a 100 yards down to a stable 1" group shooting with same ammo from a lead sled. Now, I do this on all new builds that don't have a thermal fit upper.

I've used this on a few uppers so far, and they've all benefitted from removal of their high spots. The pilot shaft fits nicely inside, and the griding surface is aligned properly.Take care to not over-grind when using a power drill. It's easy to go further than needed.

I read negative reviews but took a chance anyway, glad I did. I was able to easily true a poorly made mueller upper using this tool. Most important thing I can say is this kit did exactly what it was supposed to do, at less than half the price of the brownells tool. And this tool comes with the lapping compound which is even more of a savings because other tool does not include this. This tool is not as nice looking as brownell, but it’s built to produce square flat face on receiver where barrel extension fits into when tool is used properly, most important it’s dimensionally true. One tip I would suggest is clamping receiver clamshell in vise vertically. This allows even pressure to be applied. The weight of drill combined with a little pressure coming down vertical will ensure accurate results. Will be using this tool from now on in future builds.

A lot of reviews mention "wobble." The included drill bit adapter is flexible, and I can see where that could cause some wobble if used out of concentricity. That was a horrible design choice, imo. I think Wheeler should have omitted the drill chuck altogether altogether. You're only lapping the surface material to even it up, not machining it yourself out of a billet block. Just use your hands.I did two uppers — a $200 Vltor MUR upper & a $40 Anderson upper — by hand, and it took about 5 min to knock them both out. Doing this showcased that many times, you truly do get what you pay for. The top upper in the attached picture is the Anderson and the bottom upper is the Vltor. Notice how evenly the Vltor upper lapped (because it was already square) and how off-center the removed material was on the Anderson. I've use Andersons uppers several times before, and I've never had a problem with them not working, but this shows you how out-of-true they can actually be.If trying to squeeze every bit of accuracy possible out of a build, this is an easy step to ensure full, even contact of the barrel shoulder to the upper for maximum consistency. Just DONT use a drill.

Made in China and definitely horrible quality. The lapping tool has many dings on crucial surfaces that will cause damage to the interior surface of the upper receiver. There are also dings on the outer edges that have caused high spots on the lapping surface of the tool. Reviews posted by other purchasers have noted similar quality issues with the product throughout the years of it being sold on Amazon. Wheeler clearly does not care about improving the quality of this product. If you do choose to take a gamble and purchase it, then you should carefully inspect it upon arrival and do not be surprised if you have to return it.

The lapping tool works well; however it is not well balanced. Running it too fast results in vibration. The instructions tell you to turn it slow anyway, so follow the instructions. Prior to lapping the receiver, I did a prussian blue test on it there were low spots on the surface that mates with the barrel. It took less than 5 minutes to perform the entire lapping operation and it passed a blue check afterwards. Prior to lapping, I also took measurements of the lapping tool with a set of digital calipers and a square on a granite surface plate. The tool is consistent and accurate to at least .0001 and is square between the lapping surface and the pilot guide.

Works great. I received a good one. No issues here.

Did a great job lapping the upper on my AR-15.Made my rifle shoot MOA with a good barrel and 77gr ammo.