Interesting. My first reaction many years ago was that the individual that first concocted MAP was a chemist. After years of trying all the usual solvents, messy hot water pumping, etc, etc, which was OK for an easily removable barrel, I always considered cleaning a chore with my pinned barrels. To pour a few ounces of MAP down the barrel after plugging the vent, inverting the barrel a couple of times over a 5 minute period, and then wiping dry After a couple of patches to observe a perfectly clean patch...was a revelation! The liquid poured out of the barrel was not much different in color from the liquid that was poured in. The pH of the spent liquid was near that of water(7, +/- 1 pH unit, tested with a pH test strip) Being used in water purification systems to help activate carbon. Peroxide is depleted to water and oxygen when put in contact with carbon. Used in MAP, the carbon appears to be converted to CO2 which between the two reactions, is the “pssst”(release of gas) when you remove your finger from the end of the barrel after inverting. Where else would the usual black carbon residue go that would turn the liquid dark grey in a soapy “bucket” of water go? I suspect the alcohol and Murphy’s are additional cleaners to help solubilize the other residues. I’m not certain that anyone knows what may be exactly going on with the MAP mixture, but I recon that I have saved myself at least 100 hours of cleaning time over 20 years, and have not noticed even a spec of rust or corrosion using this process. I’d rather be shooting then cleaning!!!
