Ironruger, i agree it's nice to have the tools to remove or tighten the barrel (just in case). I haven't needed to use it yet, as I found that removing the quad rails plastic end cap I was able to get any crud out and nicely clean the barrel. I've only needed to do it once.

Regarding the air compressor, you can get some very quiet ones or you could use an air tank which can be filled from a gas station or tire shop. There's also high pressure alternatives available which are used to run air power tools or small refillable canned air. All of these are useful for cleaning the lower.