If all you can find is the PPQ, and it meets your needs, then why look for the FNS?
Logistics sometimes has a reason for offering only one model and not the other. Recalls, problems at the manufacturer, importation, or other things could create a state of none availability.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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