Hey, those "ArmsCor" M16 .22lr's are piece of junk, I have one. It says it's made by Squires and Bingham on the barrel, so ArmsCor must be a distributor or something. The one I got had it's barrel bent ever so slightly that I didn't notice it. Pulling back the cocking handle can give you a nice big cut because of sharp edges, and it doesn't even look like an M16 to boot.
Here's a link to a picture.