I have an old version of the Politically Correct (PC: Porter Cable) which came with a pneumatic brad gun, to do work on remodeling the kitchen. It's pretty-loud! The scroll screw compressors are supposed to be the most-quiet, but I've never seen a side-by-side comparison. The PC compressor has outlasted the brad gun, which seems to have developed some fatal flaw in its operation, related to the piston and its O-ring. I tried to service the gun with a gen-yoo-wine PC O-ring but it still isn't going to work, w/o having to fuss with it in-between brad strikes. I did the HFT thing, and that brad gun works well.