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1:7 twist Specifications and Features: Core15 Tac M4 Ultra Light Semi Automatic Rifle 5.56 NATO (accepts .223 Remington) 16" Barrel 30 Rounds Synthetic Collapsible Stock Midwest Industries SS Series Quad Rail Black Mil-Spec forged 7075-T6 lower and upper receivers w/Type III Class II anodized finishes Lower: beveled magwell for improved reloading speed, machined chevrons in front strap, bullet pictogram safety markings Upper: M4 feed ramps, (1913 Picatinny rail flat top) w/dry lube internal finish and laser engraved T-markings **************4150 CMV Chrome Moly M4 profile, chrome lined 1:7 twist barrel ******** Direct gas impingement gas system Gas tube made of 304 grade SS Chrome lined SS bolt carrier and bolt carrier key Magnetic Particle Inspected (MPI) Carpenter 158 bolt assembly A2 flash hider A frame front sight base (forged) Magpul MBUS rear sight Midwest Industries SS Series drop in quad rail A2 pistol grip Core15 6-position retractable sto

This rifle has a 16" 4150 CMV - Chrome Moly - M4 Profile - Chrome Lined Barrel with a 1:7 twist rate.