will the new tango down front grip fit on the bottom of an ARMS SIR?  or will there have to be modifications made to either the grip or the ARMS rail?  i believe the tango down is rock solid on a ras or ff ras, but i am looking HARD at one of those #58 Mod Sir's, man, oh man, those things look good.  so would it be rock solid on the ARMS as well.... 3rdtk, i am looking to you for this one.  
 oh and btw, what happened to the picture thread??

   Stainless

All mil spec attachments fit the SIR's, if something doesn't fit, fix that someting. Too much plastic on that civilian grips mounting area that can be easily ground off a little with a disk sander.
Good shootin, Jack

any one else have any experience?

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