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Hi Bruce, no sir, it does not have a n octagon barrel. Stay safe & have a great day!

Hi Bruce and welcome. No Sir, this model has a Round Barrel: 18.63" Cold Hammer-Forged Alloy Steel. Cheers and stay safe!

round barrel SPECIFICATIONS Model # 70410 Caliber 357 Magnum/38 Special Capacity 9/10 Stock American Black Walnut Material Alloy Steel Finish Satin Blued Front Sight Brass Bead with Hood Rear Sight Adjustable Semi-Buckhorn Weight 6.2 lb. Overall Length 36" Length of Pull 13.63" Barrel Length 18.63" Barrel Cold Hammer-Forged Alloy Steel Twist 1:16" RH Grooves 6 https://www.marlinfirearms.com/s/model_70410/