Not chrome, it has an Armornite Finish which is a hardening process like nitiriding which makes it more resistant to wear than normal.

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No it is not a chrome lined barrel it has •Armornite® Finish on Barrel - Interior and Exterior see *** in specs •13” M&P, Slim, Modular Free-Float Rail System with Magpul® M-LOK® Capability •2” M-LOK® Picatinny-Style Rail Panel Included •Magpul® MBUS® Sights •Patented S&W Flash Suppressor •Lightweight, Contoured Barrel •Forged, Integral Trigger Guard *********•Armornite® Finish on Barrel - Interior and Exterior Firearm Specifications •SKU: 11600 •Model: M&P®15T Tactical with M-LOK® •Caliber: 5.56mm NATO/.223 •Capacity: 30 •Safety: Manual Safety on Lower •Barrel Length: 16" •Overall Length: 36.6" •Front Sight: Folding Magpul® MBUS® •Rear Sight: Folding Magpul® MBUS® •Action: Gas Operated Semi-Auto •Stock: 6-Position CAR •Grip: Synthetic •Weight: 107.3 oz / 3 041.9g •Barrel Material: 4140 •Barrel Twist: 1 in 8" 5R •Purpose: Home Protection Hunting

Not chrome lined, 4140 Steel - Lightweight, contoured barrel with S&W flash suppressor; 5R rifling with 1 in 8 inch twist rate. Armornite finish on exterior and interior of barrel.

No it is not a chrome lined barrel it has •Armornite® Finish on Barrel - Interior and Exterior

It is not "Chrome Lined" but actually 4140 Steel Dave. ((Complete Specifications and Features)): - Smith & Wesson M&P15T - Tactical M-LOK AR-15 Semi-Auto Rifle 11600 - 5.56mm NATO (accepts .223 Remington) - 16" 4140 Barrel - 13" M&P Slim Modular Free Float Rail System (M-LOK Compatible) - 2" M-LOK Picatinny Style Rail Panel - Magpul MBUS Sights - S&W Flash Suppressor - Lightweight Contoured Barrel - Forged Integral Trigger Guard - Armornite Finish on Barrel - A2 Style Pistol Grip - Carbine Collapsible Stock - 30 Round Magazine - Overall Length 36.6" - Overall Weight 107.3 oz - Matte Black.

No it is not a chrome lined barrel it has •Armornite® Finish on Barrel - Interior and Exterior see *** in specs
•13” M&P, Slim, Modular Free-Float Rail System with Magpul® M-LOK® Capability
•2” M-LOK® Picatinny-Style Rail Panel Included
•Magpul® MBUS® Sights
•Patented S&W Flash Suppressor
•Lightweight, Contoured Barrel
•Forged, Integral Trigger Guard
*********•Armornite® Finish on Barrel - Interior and Exterior
Firearm Specifications
•SKU: 11600
•Model: M&P®15T Tactical with M-LOK®
•Caliber: 5.56mm NATO/.223
•Capacity: 30
•Safety: Manual Safety on Lower
•Barrel Length: 16"
•Overall Length: 36.6"
•Front Sight: Folding Magpul® MBUS®
•Rear Sight: Folding Magpul® MBUS®
•Action: Gas Operated Semi-Auto
•Stock: 6-Position CAR
•Grip: Synthetic
•Weight: 107.3 oz / 3 041.9g
•Barrel Material: 4140
•Barrel Twist: 1 in 8" 5R
•Purpose: Home Protection Hunting