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Shawn from what I can gather it's (The factory gas port is .088). However, I can't swear to this. I would suggest you contact DPMS to be absolutely sure so you switch goes without a hitch: DPMS Consumer Service Phone: 1-800-578-3767 (Mon-Fri 9:00 AM -5:00 PM EST) - Email: info@dpmsinc.com

The port in the barrel should be .088, but the only hole in the gas block that matters is the internal diameter where it goes over the barrel which should be .750. Some rifles will measure slightly less on either side of the gas block so when you measure take the block off and measure the mating surface.