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Core used to do a 1:9 Twist on their rifles. They went to the 1:7 twist a few years ago and this UPC code is of recent manufacture. So the barrel will be stamped 1:7

Its a 1:7 from the core website CORE15 16 Government Profile 1:7 Twist, 4150 CRMOV Black Nitride Finish PART NUMBER 100278 WEIGHT 5.9 lbs. (2.68 kg) Unloaded CALIBER Chambered in .223/5.56 x 45 mm NATO UPPER RECEIVER CORE15 Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hardcoat anodized finish, M4 Feed Ramps, (1913 Picatinny rail flat top) with dry lube internal finish and laser engraved T-markings LOWER RECEIVER CORE15 Mil-Spec Forged 7075- T6 Lower Receiver, Type III Class II Hard-coat anodized finish, beveled Magwell for improved reloading speed, machined chevrons in front of magazine well, bullet pictogram safety markings BOLT CARRIER CORE15 Mil-Spec Carpenter 158 Steel Bolt, M16 Chrome Lined 8620 Steel Carrier, Mil-Spec Staked Gas Key, Tool Steel Extractor, Shot Peened CHARGING HANDLE CORE15 HARDCORE V.1 BUFFER TUBE CORE15 Standard Mil-Spec GAS TUBE 304 Grade Stainless Steel BARREL *******************CORE15 16 Government Profile 1:7 Twist, 4150 CRMOV Black Nitride Finish**************** RAIL SYSTEM N/A FLASH HIDER A2 Flash Hider SIGHTS Forged F Marked A Frame Front Sight Base HANDGUARD M4 Style Thermoset molded Polymer Hand Guards with Dual Heat Shields GRIP A2 Pistol Grip STOCK CORE15 Six Position Retractable Stock TRIGGER GUARD CORE15 Oversized Trigger Guard MAGAZINE Magpul 30 rd. Magazine https://core15rifles.com/core15-m4-piston-rifle-clone.html

Go to Core's website.
https://core15rifles.com/core15-m4-piston-rifle-clone.html

Its a 1:7 from the core website CORE15 16 Government Profile 1:7 Twist, 4150 CRMOV Black Nitride Finish PART NUMBER
100278
WEIGHT
5.9 lbs. (2.68 kg) Unloaded
CALIBER
Chambered in .223/5.56 x 45 mm NATO
UPPER RECEIVER
CORE15 Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hardcoat anodized finish, M4 Feed Ramps, (1913 Picatinny rail flat top) with dry lube internal finish and laser engraved T-markings
LOWER RECEIVER
CORE15 Mil-Spec Forged 7075- T6 Lower Receiver, Type III Class II Hard-coat anodized finish, beveled Magwell for improved reloading speed, machined chevrons in front of magazine well, bullet pictogram safety markings
BOLT CARRIER
CORE15 Mil-Spec Carpenter 158 Steel Bolt, M16 Chrome Lined 8620 Steel Carrier, Mil-Spec Staked Gas Key, Tool Steel Extractor, Shot Peened
CHARGING HANDLE
CORE15 HARDCORE V.1
BUFFER TUBE
CORE15 Standard Mil-Spec
GAS TUBE
304 Grade Stainless Steel
BARREL
*******************CORE15 16 Government Profile 1:7 Twist, 4150 CRMOV Black Nitride Finish****************
RAIL SYSTEM
N/A
FLASH HIDER
A2 Flash Hider
SIGHTS
Forged F Marked A Frame Front Sight Base
HANDGUARD
M4 Style Thermoset molded Polymer Hand Guards with Dual Heat Shields
GRIP
A2 Pistol Grip
STOCK
CORE15 Six Position Retractable Stock
TRIGGER GUARD
CORE15 Oversized Trigger Guard
MAGAZINE
Magpul 30 rd. Magazine
https://core15rifles.com/core15-m4-piston-rifle-clone.html

Hi Vincent, it's 1:9 twist M4 barrel. Specifications and Features:
CORE15 Mil-Spec Forged 7075-T6 Lower Receiver, Type III Class II Hard-coat anodized finish
Beveled Magwell for improved reloading speed, machined chevrons in front strap, bullet pictogram safety markings
CORE15 Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hard-coat anodized finish
M4 Feed Ramps, (1913 Picatinny rail flat top) with dry lube internal finish and laser engraved T-markings
16" 4150 CMV Chrome Moly M4 Profile Chrome Lined Barrel
5.56 NATO caliber (accepts .223 Remington)
Direct Gas Impingement Gas System
Gas Tube made of 304 grade Stainless Steel
Chrome lined 8620 Stainless Steel Bolt Carrier and Bolt Carrier Key
Magnetic Particle Inspected (MPI) Carpenter 158 Bolt Assembly
A-2 Flash Hider
"F" Marked A Frame Front Sight Base (Forged)
M4 Style Thermoset molded Polymer Hand Guards with Dual Heat Shields
A-2 Pistol Grip
CORE15 Six Position Retractable Stock
CORE15 Hardcore Billet Charging Handle V.1
1:9 twist M4 barrel.
Magpul 30 round PMAG
CORE15 Owner's Manual
Weight (unloaded): 5.9 lbs.