I tried to call CSS but no one answered (I'm guessing they stay pretty busy). He did, however, have time to leave me a note on here, and I thank you for that sir.
The retainer spring was missing, and the pins were all jacked up... got lucky and a buddy had an extra set in his shop... so I got it all squared away. Still gives me the willies that I ran through about 100 rounds in this rifle since I picked it up and there was nothing holding those pins in besides friction and dumb luck. That is the LAST time I fire a weapon that I haven't personally torn down and gone through.
Thanks