USED METRIC RECIEVER LOCKING LEVER HORIZONTAL....FITS METRIC FAL, FAL Israel...PARKERIZED FINISH...PLEASE NOTE ...THIS ONE HAS A SCUFF ON THE FACE ..... The horizontal lever replaced the vertical lever due to the vertical lever activating from the inertia of firing a rifle grenade Early models, StG-58, G1, used the vertical...... AND FN, RSA, Argentina, Brazil, paratrooper, etc. used the horizontal.