For some reason my rifle wont cycle Wolf .223 ammunition. But it will shoot other ammunition such as Remington UMC. Now is this due to wolf is cack ammo or does my gun have a cycle problem and is their a way to make it cycle wolf because ammo is really becoming more and more pricey. Also I have been wondering. At classicarms.us they have a .22lr m4 style rifle out. Now say Id purchase that and take off the upper, would i be able to mount a .223 upper on it as well or is that a lower specif designed for the .22 round? Now im not sure if I put the question where it will make sense but hopefully you can tell what I am getting at.