I have an MPX gen 1.

Paperwork is in process.

I like mine. I used it in a local competition and it shot well. Dad is running it in competitions now. I have had no problems whatsoever with it...that being said they seem to be hit and miss. They have already started selling a gen 2 version. Some parts are not interchangeable. There have been feeding issues, fit and finish issues...mags not interchangeable....

Again...I like mine. Had no troubles at all. But there are a number of others that have had trouble.