This is a 5.56x45mm caliber bullpup rifle developed by the Israelis and includes a 30 round magazine. Additionally the common Israeli infantry rifle has automatic and semi-automatic capabilities.
The IWI Tavor/Tar-21 is a common infantry rifle used by the Israeli military.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.