I've heard of sorbo (youtube videos show it isn't that great), a silent piston head/cylinder head combo, and even supressors. But, my question to you is, what has worked for you? Help me save my money and avoid buying stuff that doesn't really work. Thanks guys. If possible, I'd like the quietest "thud" or "woosh" sound out of the gun as possible when the piston hits the end of the cylinder. Thanks.