Was searching the net on the ACR's upper composition and came across a few sites that stated the upper is extruded rather than forged. What gives? Also, anyone here know whether or not the aluminum is 7075 or 6061? I'm assuming 6061 if it is extruded. If that be the case, then I'm pretty disappointed that BM would cheap out and go with a softer material and an extrusion process and still charge a premium. Maybe I should have gone with a KAC SR-25 instead...