re: Finally ordered AR stuff,non high dollar gun

I hate to continue to drag this out but the heat dissipation advantage is probably negligible if it even exist. One piece or 50 pieces..its all 7075 Aluminum. As for assemly your trading screwing in a rail for trying to time a barrel nut with a special wrench and limited range of motion. Also, Aero's C.O.P. system is not truly one piece, the bottom rail is another piece. Lastly, it looks like the M4E1 you mentioned getting doesn't use the C.O.P system and is not a "monolithic" variant. Instead it uses a seekins barrel nut and Aero rail...a typical free float "multi piece" set up.