[1911]

I am looking to buy a luger to shoot and for a collector piece. I want one that actually saw service in wwii. I am thinking a 4 inch bbl might be best for me. How much should I expect to spend? I have heard the following about lugers: By design they are one of the hardest kicking handguns and even kick harder then a 454 casual and are as loud or louder then them as well. I dont see how that is possible if it is a 9mm? I have also heard that if you hold the trigger they will fire full auto. Is any of that true? Thanks