What's the difference between the 2?
I've only barely seen or read something about this but I believe the 15-22 lowers are shaped differently and are wider than AR lowers. I think, maybe possibly, there's a difference in the take-down pins also.
[link=(can a .223 upper work with a 15-22)]Quick Google search says "no". [/link] The 15-22 lower is proprietary to itself only.
This post was edited on 3/18 at 4:32 pm