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Posted: 2/15/2015 12:29:37 AM EDT
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I just received an AO Precision stripped upper receiver purchased from Andro Corp and it is very nice. Dry lube on the inside, just like my factory LMT uppers. The T marks are nice, big, and bright. It has a circle forge mark, which I've never seen before. I installed a Stag Arms kit and everything fit fine.
I had purchased an Anderson stripped upper several weeks ago for the same price, and the fit and finish are also nice, but no T marks and no dry lube. The Anderson has a keyhole forge mark. For the Anderson I installed an RSM kit, which fit fine. For the price I prefer the AO Precision upper. So for about $66 with shipping charges you can get a very nice M4 upper receiver with dry lube and T marks. Dry film finish on the inside 
Nice, big, bright T marks 
Anderson on top, AO Precision on the bottom 
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Quoted:
no dry lube in the anderson because it uses a proprietary nano lubricant. :) Yes, fascinating with the RF85. Nanotech has been hot for awhile, it's interesting to see it show up in the good 'ol AR-15. I bought my Anderson stripped for $40 so I don't think it has RF85. Besides, I run my AR's wet, to shoot one without lube would take a . . . mindset adjustment 
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