Just another data point, but I picked up an Aero precision lower and thier COP upper (thier integrated rail system upper) and the machining work on both were quite good, better than I expected actually. Fit was excellent on both as well.
Haven't run the gun at all yet, but it's slated for a carbine course or two this year, unless the LaRue PredatAR I have on order shows up.
I purchased an Aero Lower and obviously it fits with the Aero Upper It fits very very nice and snug and lines up perfectly, I love it
I think they are same (now as one bought the other).
C4
Nothing I've seen has stated AO Precision and Aero Precision have ever been connected in any way. There may be something I missed but I don't believe so... I've done a few dozen builds with AP uppers and/or lowers without a hitch. Definitely on my GTG list.
Make sure its not the receiver extension hitting before shaving the upper rear lug.
Reason I say it is because my mega uppers won't close on my aero lowers unless I back the receiver extension out one turn. Not sure why, as they fit perfectly on mega lowers, but it is what it is for some reason.
I like to forward my receiver extensions/buffer tube so that the upper WON'T fit. I then lightly file until the tube is "matched" to the upper. You then it a REAL tight fit with no wiggle what so ever.
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