Very nice rifle and a GREAT price as well ! I've seen these rifles with a few different variants in their rebuild. Your rifle still has the original Mk.I rear hand guard with it's integrated sight protector removed... I've seen them with both the Mk.III "upgraded" rear sight protector and Mk.I integrated protector on the same rifle. Some of these rifles are still in complete Mk.I configuration having only their serial numbers changed, as is the case with mine.