I picked up a Para P12 a couple months ago at one of the shows. It had been upgraded quite a bit, but the frame had some scratches. I stripped it to the frame and had it Ceracoated. One thing that I noticed is the guide rod has a liquid in it. You can hear a 'sloshing' sound when you tip it up and down near your ear. Not very familiar with 1911's, I'm assuming it is recoil reduction, but can anyone tell me about it?