ALL polishes are abrasive!!!!! Why can't anyone understand this? If they weren't they wouldn't polish anything. Some are mild, some quite aggressive, but they are all abrasive to some degree.
Mother'contains Aluminum Oxcide which is an abrasive. Aluminum Oxcide is used in most sand papers of varying grits. The petroleum distillates chemically remove oxidation and small imperfections or sometimes in this case "intended finishes". As does AL2 O3. Flits contains Cristabolite which is near quartz in hardness and also an abrasive. Yes, both work great as polishes.
On some of the older stainless finishes, the factory satin finish is very difficult to reproduce. I've come very close to producing that finish on a couple repairs. It's a tedious job to do it right.
I'm just cautioning anyone that wants their original satin finish, to avoid the abrasives and petroleum distillates that the polishes contain or you will get a polished finish over time or sooner, depending on how much you're planning on polishing. Even if you rub carefully, it will do as I have stated. You can't avoid applying abrasives and oxidizers without getting these results. That is what polishes of this type do.
Once you begin to polish, deeper and smaller scratches in the finish will begin to appear (as you approach a mirror finish) under the original finish which prompt you to polish further to remove them. This is trail you start.
To do a professional job, You must disassemble. I use Dremel tools to get into the small areas, polishing rouges, cotton wheels with careful steps not to overheat the metal causing orange peel etc.(yes, orange peel on stainless using power polishers) to get the correct results. You can polish by hand but good results take a lot of time. Polishing into recessed areas and against ledges are hard to achieve unless you know how to get in there.
Polishing the side plate in place is important so that you don't round the edges. These are things to think about. Tape off the frosted areas like the top strap. I use a glass bead system to restore damaged areas with perfect results. I customize areas with the frosting process and add laser engravings to sideplates and other locations.
Of the recent finishes I've see coming from Smith...they look more like a used truck gun than a new production finish...which is a shame to produce. It seems like one must look at older finished stainless to realize what they should look like.
Flitz sells a matte finish cleaner that works great on AR's and finishes you don't want to change with polishing. Use the right products for the finish you're working on.
I have several that I have done that look fantastic. But I completely disassembled and used the proper tools and products to produce a high gloss finish. I like both styles of finish. The ones I've polished need something done and I gave them a custom finish. here are a couple...
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