The info I got was it's an 'Experimental' rifle. 400 were made, 100 of 'X', 100 of 'XA', 100 of 'XB", and 100 of 'XC'. They were later given out as 'Presentaion Rifles' to employees and high ranking military peoples. This rifle would then be 83 out of the first 100 made. Scuttlebut is there's great collector value in the rifle if it's in original shape, price ranging from $1500 - $2000. I gave the info to my buddy and will see what he wants to do.