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Hi Ibrahim, It's a 16" Chrome Lined and Phosphated Barrel. SPECS -- SIG Sauer AR-15 SIG516 Patrol Semi Automatic Rifle--- 5.56 NATO caliber (accepts .223 Remington)--- 16" Barrel --- >>>>> Chrome Lined and Phosphated Barrel--- 30 Rounds --- Black Finish--- 35.7" Overall Length --- Mil-Spec Trigger--- 7.6 lbs Trigger Pull --- 1:7 Twist --- 6 Grooves --- Gas piston operating system--- Four-position gas regulator--- Free-floating military grade chrome lined barrel--- M1913 Picatinny flat top upper--- 7075-T6 Aircraft grade aluminum upper and lower receiver with hard coat anodize finish--- Flip-up iron sights--- Magpul MOE grip and adjustable stock---

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It's a 16" Chrome Lined and Phosphated Barrel UPC: 798681441426 Description: SIG 516G2 PAT RFL 16 5.56 30RD Brand: Sig Sauer Model: SIG516G2 Patrol Type: Rifle: Semi-Auto Caliber: 5.56 NATO|223 Finish: Black Action: Semi-Automatic Stock: Telescoping Stock Sight: No Sights Barrel Length: 16 Overall Length: 36.5 Weight: 7.4 lbs Capacity: 30+1 # of Mags: 1 Safety: Ambi Thumb Safety Receiver: Aluminum Features: 4 Position Short-Stroke Gas Piston System; Integral Ambi QD Sling Mount, Mag Release

This rifle comes from the Sig Factory with a !6" - Chrome Lined and Phosphated - 1:7 Twist - 6 Groove - Barrel Ibrahim.