If no one here has direct experience with the APS UAR perhaps you should be the one to gain it.
Google "aps uar problems" and "aps uar experience". There are some common themes for the people who have reported issues - mag fit, mag feeding, long/sloppy trigger bar assembly.
There are two versions of this rifle, the second gen apparently fixing a few problems including mag compatibility. The easiest way to tell them apart is the second gen is rear-wired, the first gen front.
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