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Jeff, Sig's site lists 29.5oz. https://www.sigsauer.com/store/p320-nitron-full-size.html

29.5 OZ see ******* Specifications and Features: SIG Sauer P320 Full Size G320F9B 9mm Luger 4.7" Barrel 17 Rounds Polymer Frame Contrast Sights 8" Overall Length 5.5" Height *****29.5 oz Stainless Steel Slide Nitron Finish Striker Fired Trigger 5.5-7.5lbs trigger pull Polymer Grip Module

Jeff, 29.5 oz's unloaded and 33.88 oz's fully loaded with 18 rounds of 115gr 9mm ammunition.