Sorry to bring up an old thread. But i have some experience with the M223. I'm on my second 1-4x M223. They are ok if you are on a budget. The windage knob on the first one I got failed within 2 range visits. The scope itself was under warranty, but it was very inconvenient not having an optic while they were shipped back and forth. One of the selling points was the turrets. But they have turned out to be a liability. One of my favorite places to shoot is on a very bumpy road. The way my rifle was cased, the elevation knob was pressed and turned 21 clicks without me knowing. It sucks finding that your optic is no longer zeroed the hard way. Rezeroing your rifle every time you shoot because you have no confidence is annoying. I would like the turrets to lock in a similar way to a Vortex.
If you are looking for a 1-4x, I'd suggest a Vortex Viper, Burris MTAC, or Burris Tac30. They are a bit more expensive. But you will be happier with one of the other options if you are a gamer.
I'm currently looking for an MTAC, but I still plan to use my M223 for a .22 upper once I find an MTAC.