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Hi Marcus, It is Non Ported. This combined with the new interchangeable barrel system of the CZ 455 will allow the user to easily change the stock configuration as well as the caliber of the rifle.

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The barrels on both sets are not "Ported" Marcus. It ships with two barrel sets, a single-shot 'un-single' with a dial-adjustable aluminum rib (adjustable from 50/50 up to 90/10 point of impact), and a standard set of barrels with stepped rib (50/50 point of impact). Includes 5 chokes (C, IC, M, IM, F)

All barrels are ported see article "The double-row porting on both barrel sets pairs with the 8.5 pound overall weight of the gun to reduce felt recoil substantially" http://www.guns.com/review/gun-review-cz-all-american-trap-combo-shotgun-video/

another article with specs see ****** CZ-USA All American Trap Combo Features •Manual trigger and safety •32" un-single barrel with dial adjustable rib, (90/10 to 50/50) •32" un-single barrel with dial adjustable rib, (90/10 to 50/50) •Fully adjustable stock, parallel comb, toe in and out, cast on and off, length of pull. Trigger shoe reach adjustable •11 extended knurled chokes, 2 cylinder, 2 imp. Cylinder, 3 modified, 3 full, 1 xtra full. Rem Choke configuration ***********•Ported barrels with lengthened forcing cones •Manual trigger and safety •Healthy right hand palm swell •Durable silver soldered ribs •Rugged airline-safe case https://www.ssusa.org/articles/2017/1/30/cz-usa-s-all-american-trap-combo-a-new-gun-for-an-old-game/