Something like a PSA is the LAST AR I'd recommend for someone needing one strictly as a tool. ARs like the PSA must be shot- and shot a lot to expose any fixes they need such as extractor springs, hammer springs, over sized gas ports and so on- before they can be considered reliable enough for use as an emergency tool.
The PSA I had was rock reliable, but not until I'd put out through its paces and addressed its shortcomings.
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