A1 - I do believe that a few people on here have had the Choate Tac inlet for AICS and factory mag setups. I don't know why you couldn't, I had one but I didn't have it inlet.
A2 - Didn't know there were aftermarket nuts, the factory ones are plenty good so I don't know why you would want an aftermarket nut. The lug is definitely worth the upgrade. Northland Shooting Supply has a great one. I have two so far and plan on more as needed. SSS also has one that I have heard is good, but have not seen one personally.
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