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

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