Works great
First of all, it's MADE IN THE USA. I used the 800 grit lapping compound to accurize/lap a AR-15 upper receiver before the barrel was installed. By reading reviews from previous buyers, I chose the 800 knowing it would take longer to do the job but when it only takes about 15 minutes, it really didn't matter to me. Most people use a much lower grit and that is fine but I wanted a smoother outcome plus I think the 800 has less wear on the lapping tool. I also chose to NOT use a drill and simply turn the tool by hand and did so in the vertical position allowing the tools weight to do the job. Yes, it takes much longer (still less than 15 minutes) but I can control the pressure and using a drill puts more pressure to one side. Every few minutes, I would check the progress and in doing so, I did remove the used compound and re-applied new compound a few times as it gets pushed out from the weight of the tool but that is to be expected. And lastly, there is enough compound to accurize dozens of receivers. If I were to buy more, I would consider the 600 grit but I am happy with the 800 grit.
Lapping AR receiver
Used this with the Brownell's 080-000-182WB lapping tool to true the forward end of an AR receiver. I wanted a non-embedding lapping compound for the purpose, and this worked well, flattening and truing the end quickly. It was educational to see how just how NOT true that surface was on a mid-priced mil-spec upper. Didn't notice any issues with cleaning it off either the tool or the receiver afterward.
Great for finish fitting precision parts
This stuff is great for softer weirder metals like some of that MIM junk that Colt is using on their new revolvers. It is also good for SOME autoloaders, rifles, shotguns, etc. It is good for some pistol slides, and the slide to frame fit. Aluminum oxide works better on some metals and garnet on others. I like garnet for some of the low grade stainless steels, and for MIM alloys. High carbon steels, and 4150 stainless and I will usually use aluminum oxide. Tool steel also works better with aluminum oxide lapping compound. This stuff works very well with MIM, and stainless. I can easily tell from the feel, if I want to continue with Garnet or Al Oxide, or swap from one to the other. They both have their place in the shop. The coarser grits also have their uses for deburring, melting, and rough fitting parts where I need to remove more material fast. This is also good for other items besides guns, such as guitar parts, where I do NOT want any binding. It will polish out bridge saddles so the strings do not bind. So these lapping compounds can help guitars with tuning stability too.
Perfect Agression
For fitting slides to frames after Cerakoting, this is perfect. Works quickly but not overly aggressive. Just a few slide racks with this on the rails and you are good to go on tight fitting actions.
The Best Fit for a tight fit!
What ever you work on this will put a smooth finish on everything from slide rails, bolt faces, even guides rods and bushings. Put it on a mop or mating surfaces and give it a little friction till the fit is tight and the burrs are gone. Use courser compounds to remove ridges and fine machine marks.
