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Looking at pictures they look to have different optics plates. I can't find anywhere stating what optics the pro version is compatible with. The pro version looks to have the optics plate in front of the rear sight, so you don't have to remove the rear sight to install an optic. Where this version the rear sight is on the mounting plate, so would have to remove the rear sight to install a red dot. Looks to be the only difference. I'd contact sig sauer to see Wich optics the pro version is compatible with at 603-610-3000 OPTION 1 8:30am – 5:00pm EST. Hope this helps.
Stanley, could be a listing issue. I would contact Sig Customer Service for accurate info at 603-610-3000 Option 1 8:30am – 5:00pm EST.
I would contact Sig Customer Service for correct info 1-603-610-3000 Option 1 8:30am – 5:00pm EST.
The Pro model P320 has the optic cut/plate in front of the rear sight. The other models do not.