Scotty, just when I start thinking you know what you're talking about you say something like this. The barrels on most ARs are parkerized, the BCG is parkerized, the springs are chrome silicon, the entirety of the FCG is parkerized or given some coating, and the receivers are aluminum. Please explain to me how any of those components are going to rust from simply hitting them with a bit of water as long as you dry them out (Compressed air works well for the nooks and crannies) and then oil and lube the individual parts. If you are properly oiling and lubing your rifle then there should be no problems as the parkerizing used will trap the oil within it creating a barrier between the water and the steel thus inhibiting the formation of rust.
Additionally, it is actually wiser to remove the mud and other sediment as soon as possible, as the acids and other minerals in the sediment are more likely to cause rust than the water. Additionally, I can name a circumstance where it is necessary to use water, and that is when your weapon has been submerged in saltwater. The only truly effective way that I know of to remove the salt and possibly sediment from the rifle is to hit it with freshwater. After the salt has been removed, you then dry off the rifle and properly oil it.
As for the OPs question, there are several different rails that you can take apart relatively easily, including the KAC RAS series, the KAC RIS series, the Centurion Rails, the Daniel Defense Omega X Rails, the Daniel Defense RIS II Rails, and I think you can take the lower rail off the URX II/III series (don't quote me on that, I don't own any rifles with that rail system).
"Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." - H. L. Mencken
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