Knife ID

[ww2imposter]

I do not know a lot about edged weapons but couldn't pass this up today while standing in line at a gun show for a hundred bucks. Ontario USA new in box. What model/vintage is it?
I do know it fits very well on my M4.
http://i33.photobucket.com/albums/d55/boomerangsrd/009-2_zps743cd9e4.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/008-5_zpscea1d3b8.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/010_zps3570815d.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/011_zps8c4579ba.jpg
http://i33.photobucket.com/albums/d55/boomerangsrd/012_zps4c7ea294.jpg

[M1Garandy]

I think it might be this: http://www.ontarioknife.com/catalog/item/271