Hello, does anyone know where there is a complete list of Arms mounts? I see tons of different arms mounts but when I look for them I rarely can compare because they don't carry all of the mounts. Thanks

Try this.

[url]http://www.armsmounts.com/index.html[/url]

ARMS website is VERY incomplete.  Unfortunately its not one of their current priorities.  Can't blame them, w/ everything in the world that's going on, and the constant M16/M4/SPR upgrade bids that are going on.  To answer your question: Start at Cal's for pics

http://www.calssportingarmory.com/ARMSMounts.htm

Be advised many will tell you and will jump all over me, I'm ready, for advising you of Cal's.  He apparently has had some dealings w/ the ATF, the details I'm unsure of.  Little matter, though, I'm not advising buying through him, I haven't, for no particular reason though.

I prefer to support the site by supporting our "embedded" suppliers/dealers/advertisers.
Having said that the most fully, and early model stocking dealer I know of is Wes and Paul over at http://www.mstn.biz/, I also have never ordered from them, but everyone has positive things to say of the two, and they will answer your questions until YOU are sick to the stomach.  (Thanks guys).  They will have even the ARMS #'s Cal's does not pic. and have tons of images of ARMS' stuff, and will explain what you need and what will properly interface.
Based on my experience if they can't get it from ARMS, it can't be gotten.  LOLk, SUL2