Yawn! Not another M4 but based on the drawings we received from Modify-Tech, this will be different. If you look at the Modify (Xtreme Tactical Carbine) XTC closely you will see that the receiver is re-designed, with a new grip; a the new ambi fire selector that goes MP5 style (meaning the lever only travels 45degrees instead of 180); new steel trigger; and LED in the HiCap mags so no need for separate tracer unit, rotary HopUp chamber.