Almost perfect
This is an awesome Lower, the FDE was flawless. The only issue I see with this is the mag catch. Even the Aero build kit doesn’t have enough threads to be flush on the button so you hide it with Magpul extended button or accept only a few threads are holding and there is a hole in the middle of the mag release button
Great Lower
Love Aero, but quality control could be better. I dont know if anyone else has experienced this but I had a lot of debris in the holes for the take down pin springs. Took me about 10 minutes to take all of it out. For a con, I put fitting required because I couldnt fit the spring in until I took out all the debris. Still though, a solid product.
Feels good
Have not built it up yet. Have gotten parts kit for it, just not put together yet
Good value
I own two of these lower recievers. Price is great when they are on sale. Seems to me that the fit between this lower and the matching upper is a little loose, but it has a tensioning screw to take out the rattle and tighten things up. The gap between upper and lower is more than I would like, but at the price I paid for it this was not a big deal. Other than that I love everything about it. I wouldn't hesitate to buy another one.
Good platform need specific parts
This is a very nice lower. The adjustment screw makes the upper sit without play. Recommend using the Aero parts kit as a few parts on other kits (dpms) dont fit well. Mag release and rear pin in particular. The Aero upper fits spot on. Would build others on this platform.
Good but with an issue
The problem reported with the mag release button is solved by using the Aero Precision AR-10 Lower Parts Kit without Trigger and Grip which includes an elongated release button. (I never used a complete Aero LPK). However, this solution does not allow use of other mag release buttons. A longer threaded mag catch would have been a much better solution.
Aggravating mag catch
My second build on the M5--first was a 243, this one a 6.5 Creedmoor. Same issue both times--Dang magazine release needs to be longer. 2-3 threads is NOT acceptable and does not allow use of an extended mag release button (the part that screws onto the button will hit the receiver frame before the mag releases. I think Aero thought they solved the problem but making a longer button and it will work but doesn't lend itself to any aftermarket goodies. Used DPMS lpk's both times--is the CMMG longer???
A Bit tricky
Have built on 5 of these upper and lower combos. Only complaint is two fold: One, the magazine release REALLY NEEDS to be an extended mag release, and Secondly, that the front pivot pin is tricky to put in. Tip: use a 1/16th or smaller Allen wrench to push the detent and spring down while pushing the pivot pin it. Other than that I have used the DPMS and CMMG 308 lower parts kit that fit perfectly. I have also used a standard AR-15 lower parts kit and swapped out the bolt catch, pivot and take down pin for the 308 sized and was good to go. Bonus, lower has a tensioning screw that can be tightened against the upper rear lug to remove play between upper and lower
Quality lower
Quality lower receiver. No tool marks anywhere except some very minor ones inside the magazine well, does not effect performance or cosmetics. Used the CMMG parts kit, some fitting was required for the take down pins to fit, was just an extra 15 minutes of sanding. All other parts went in without any problems. ALG Enhanced trigger group fit right in, no tools required. As mentioned by the review below the magazine catch button does not screw all the way in, but if you look at DPMS or Bushmaster 308s you'll notice that these factory rifles are the same way. It's because DPMS patterned 308s use AR-15 mag releases.
