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.
Looks like threaded material to me. Like the previous poster stated, See if they are magnetic. If they are, it could have been a bolt that got misplaced or dropped during a previous rebuild. No telling what damage it has caused until you start tearing the engine down. There is a good chanch you...