SIG SAUER XM250/M250 BeltFed Light Machine Gun (LMG): How ...
The primary combat optic's mounted on the M250's rather interesting rightrotating feed tray. Returntozero for the feed traymounted optic is currently MOA (Minutes of Angle), which is "good enough for a machine gun". The M250's offset iron sights are there thanks to a US Army requirement that they be there.