From my post of 05 Feb 2003:
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"I believed that the PSS after the model 700 stood for Police Sniper Special, and that it was later changed to just P, for Police.
Another contributor to this fine forum said that it meant Police Sniper System, and yet another opinion was that the P stood for Parkerized.
So I e-mailed Remington and asked them. Here is their response:
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"Thank you for your inquiry. The Model 700 PSS stands for Model 700 Police Sniper System and then we changed to the Model 700 P which stands for the Model 700 Police."
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Just thought you may like to know...
Alex
P.S. What ever we call it, it is great!
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Anyway, that's what Remington said back in February.
http://www.thehighroad.org/showthread.php?s=&threadid=7204&highlight=pss