This armor piece is the lower right arm. It was designed for use in an air-soft war (more armor will soon follow) and has two weapons on it: a hidden blade (I DID NOT design that, Supernewf54 designed it, so give him full credit for the blade) and a small gun. I will soon make the upper arm and, possibly, a chest piece, all for use in an air-soft war.
I will not post instructions for this piece, as it is too simple. If you have problems with the blade, look up knex assassin's creed hidden blade and just browse for the instructions.