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.
None of my manuals make referance of it. My M-211 has it also. A good guess would be an air intake for the heater box. I could be wrong but I seem to have seen it mentioned some where.
It is the cover for the heater inlet. Part number YT-2281322. A picture of the cover and its part number can be found in the M211 parts manual ORD 9 SNL G-749, P.393 and p.396. A copy is in the resources section.