Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
Clarification/ edit
I -think- yours is same as mine, twin M73's w/two matching gimbles. I believe the designation is M706E1. Here is the stamping on turret, looking down, front of mantlet. To mount a 50 someone probably welded your support plate (that a fork bracket can bolt to). I have a pic...