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Ryan, this rifle has a 16" 4150 Chrome Moly Steel Chrome-Lined barrel with 1:9" RH twist, 6 lands and grooves.
Barrel material: 4150 chrome-moly steel with chrome-lined bore and chamber see *****Caliber: 5.56 NATO/.223 Remington Action: Semi-automatic Capacity: 30+1 Barrel length: 16" ***********Barrel material: 4150 chrome-moly steel with chrome-lined bore and chamber Barrel twist: 1:9" Stock: Synthetic Upper receiver: Machined from 7075 T6 aluminum forgings Lower receiver: Machined from 7075 T6 aluminum forgings Sights (front / rear): Fixed/MBUS® flip-up Flash hider: A2 birdcage Overall length: 35.5" Overall weight: 6.42 lbs. Mfg. Number: 90291 UPC: 604206113382