Thank you all very much for the help. As for the owner being legit yes I believe he is. He lives only a few hours away in the next county over and has offered for me to come up and put some rounds through I just haven't taken him up on the offer. I only have 200 dollars down on the gun & the cost of the two stamps. The rest of the payment will be paid upon me picking it up when the stamps come in, I even offered to pay in full from the get go... (right around 149 days since I went pending Apr 11 2013, prior to that the check was cash on the 26th of Feb).
So let me make sure I got this right, Non converted, and the magazine is a converted PAM2. So that's good news for me since I have a small box of madsen mags.
Thanks again all of you for the help
FWIW browsing this site the last quarter of the previous year made me pull the trigger so to say on buying this mac/suppressor as my first NFA purchases.