Many have reported good results in regards to "smoothness" using Lurker's Marq spring on a gen1 Marq. The spring will only work with the stock Gen1 engine. It will not work with the proficiency or supercharged engines.
Now if we can just get a picture of both sides of each and every one of these markers in their original configurations and formats! THEN this will become my favorite ultimate single page on all of the Internet/Web!