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Hi Timothy and welcome. Nothing. Carbon is just the name Diamondback uses for this model. This Diamondback DB15 rifle features a carbine-length, medium 4150 ChromeMoly barrel, Carbine-length gas system with pinned gas block, and a shot-peened Mil-Spec 8620 bolt carrier. The DB15 utilizes 7075-T6 aluminum receivers, 15" M-Lok anti-rotation handguard, Magpul MOE grip, and a Magpul Carbine stock. Cheers and stay safe!

Nothing at all. MANUFACTURER: Diamondback Firearms FAMILY: Carbon Series MODEL: Carbon DB15 Rifle TYPE: Rifle ACTION: Semi-Auto CALIBER/GAUGE: 223 Rem | 5.56 NATO FINISH: Black Anodize Hardcoat FINISH TYPE: Black STOCK: Collapsible / Folding Stock STOCK/GRIPS: Magpul MOE Carbine Stock BARREL: 16" OVERALL LENGTH: 32.5" to 35.75" RATE-OF-TWIST: 1-in-8 CAPACITY: 30 + 1 # OF MAGAZINES: 1 MAG DESCRIPTION: Gen 2 PMAG SIGHTS: No Sights SIGHT TYPE: None THREAD PATTERN: 1/2x28 SPECIAL FEATURE: Threaded Barrel WEIGHT: 6.56 lbs. SHIPPING WEIGHT: 8.2 lbs. SAFETY FEATURES: 2-Position Thumb Safety RECEIVER: Forged 7075 T-6 Aluminum ADDL INFO: 15" Aluminum M-LOK Rail ADDL INFO: A2 Flashhider ADDL INFO: Magpul Moe Grip

Hi Tim, the barrel is 4150 CrMov (Chrome Moly Vanadium). The "50" in 4150 steel is an indicator that the barrel steel has a carbon content near .50% (Don't mis-read that, it is not 50%, but one half of 1%) Carbon is what Diamondback has decided to call this series of rifles. Stay safe & have a great day!