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Let’s play the “What is it?” game!

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Indeed it is, Herd.
Your turn!
 
I don't know of a single factory AR lower receiver with a slick sided magazine well like yours, without any ridge running around the bottom edge for strength and to allow for a beveled surface for quicker mag insertions.


Even the original ArmaLite rifles from the 1950s and Colt's SP1 from the 1960s had such a ridge at the bottom of the magazine opening.

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Herd, it looks like your AR's upper receiver also has the magazine well as an integral part of the upper,

and the lower receiver is basically just the trigger housing and an attachment point for the stock and the pistol grip, is that correct?
 
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