I stopped into my local sporting goods store, looked at the Colt M4 and the 15-22 side by side and I'm having trouble making up my mind between the 2. I know the bolt release on the Colt is non-functional, but aside from that it looks and feels like a real AR. It's made of metal and could pass for an assault rifle if pointed at an unwanted intruder. I also think Colt stamp on the side might increase the resale value. The S&W on the other hand has a functioning bolt release but looks and feels a bit like an airsoft gun you would find at wal-mart. Anyone have experience with both? What are your thoughts?