Hi Bryan, on top of the slide, there is a cut-out exposing the top of the barrel to decrease the weight of the gun as seen here in pic #6 of 22 (put a G in front of the link) >>> unbroker.com/item/1104883966
Stay safe & have a great day!

Hi Bryan and welcome. The barrel is not ported but, the slide has a lightning cutout on top of the slide (3rd picture down). Pictured here: gunsinternational.com/guns-for-sale-online/pistols/glock-pistols---g35/glock-35-g35-gen-4-dark-earth-cutout-slide--40-s-w.cfm?gun_id=102379778#lg-3 ----------- Cheers and stay safe!

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