Almost the best I have seen

I gave it a 4 out 5 because the pivot pin plunger hole is IMHO out of spec by .030, even though Aero states that you have to use an Aero LPK to get a flush fit pivot pin. Finish was good, nice flair on the magwell and I liked the 60* markings, even though I use a 45* selector. Cons are you really need to use an AERO M5 upper or your build will look bad. I suggest using a standard CMMG LPK and buy the pivot pins and bolt release from Aero's site.