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Jim, I could not pin this down either. I would just ask Sig Customer Service for the sake of accuracy at 603-610-3000 option 1 - 8:00am – 5:30pm EST.

It stands for pistol see example SIG MCX RATTLR PST 300BLK 30RD https://www.budsgunshop.com/catalog/product_info.php/products_id/108771/sig+mcx+rattler+pistol+300blk+55+folder+brac

Jim, PST is nothing more then an abbreviation for "Pistol"