BudsGunShop.com - Is the barrel nitrided?

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

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

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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---