Bookhound, you weren't to harsh, I deserved it, it was my own ignorance that made me misunderstand tweaks reply, as far as the beta goes, I'm not going to do anything to it, and I think even with the ejector wacked off the block it still wouldn't work, I should have researched the 9mm setups a little better before I bought it, because the original idea was to put a beta on one, and have a run and gun setup for the tac range, to eliminate mag changes, and I was also going to get a can for it, cheaper and quieter than the 556, I jumped a little to fast. The olmpic upper, works great with the sten mags that came with it, I have never had a single problem, with the exeption of over filling the 32rd mags, they will only feed with 28, I am an optimist though, surely there is a way to make it work, it may involve getting a new upper, but damn it , I am going to have a 9mmAR with a beta mag-hahaha, if you can think of anything that will make the OLY work, let me know, meenwhile, I will keep working at it, I haven't tried to contact Olympic arms to see if they have an adapter, I have their catalog, and I don't recall seeing one. thanks, Treeman