Aero Precision Cerakote Lowers
- Thread starter Sinasta
- Start date
So now that we know the upper isn't the issue, is it the front lug that simply can't fit in the lower? Your problem is pretty much guaranteed to be the Cerakote being too thick in that spot, because Aero machines their lowers so that after anodizing, they are exactly on spec, and by that I mean not even a thousandth off. I don't know if they cerakote on top of the anodizing, or on the bare aluminium.
"Milspec" has nothing to do with anything here. It's the blueprint and allowed tolerances that matters. I've measured a few Aero lowers with calipers, and they were pretty much all bang on the blueprint specs + or - .001, but that was one lot from years ago. Unless you measure your upper with calipers and check against the blueprint, you won't know if it's in spec or not.
When you close an upper on a lower and pin the front pivot pin, there is supposed to be a slight gap between the upper and lower with light passing through.
Do you see a gap with light passing through, and is it even from front to back? Is the curved back of your upper making contact with the lower, where the receiver extention is screwed in? This is a close tolerance area (my one Aero lower with an Aero upper has about a .0005 gap between the two, if anything), and if the lower has too much cerakote at the top of the curve where it goes vertical, the lower might not be able to go all the way down. Do you get where I'm going?
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When we say "Milspec", I think we can agree that this is shorthand for saying that the manufacturing is within sufficiently close tolerances of the milspec blueprints to allow interchageability with parts of similar tolerance - so in that sense, Milspec matters. Dietz, are you challenging for "Sunray's" vaunted persnickety, how-many-angels-dance-on-the-head-of-a-pin title?
Aero lowers and uppers fit each other and they work very well. My experience is that they don't always fit other components. In my case, there was no space between upper and the Aero lower and the rear pin pathway was still obstructed by a few thousandths.
Aero lowers and uppers fit each other and they work very well. My experience is that they don't always fit other components. In my case, there was no space between upper and the Aero lower and the rear pin pathway was still obstructed by a few thousandths.
Yes there is light between except near the front pivot pin.
Try fitting the upper and lower together without the pins. Even with Cerakote there should be a clink type sound indicating there is not an unnecessary build up of Cerakote. Then see how the holes line up. If there is too much Cerakote at the front, the front holes won't line up and same with the rear. Sometimes the holes in the lower line up, but there is a slight build up in the holes of the lower and the pins won't go through. Run a small fine round file in the holes if you think that is the issue.
