Randolph, this rifle has a 20" Chrome Moly Vanadium Government Profile Barrel and is chrome lined with a Chrome Lined Carrier Interior Carrier Key - chrome lined, attached with Grade 8 Screws.

this rifle has a 20" Chrome Moly Vanadium Government Profile Barrel and is chrome lined Specifications and Features:
Del-Ton Inc Echo 316L ORFTLW160
AR-15 Semi Automatic Rifle
Lightweight Optics Ready Carbine
5.56 NATO accepts .223 Remington
30 Rounds
16" Lightweight Profile Barrel with M4 Feed Ramps
1:9 Twist with Threaded Muzzle and A2 Flash Hider
Manganese Phosphated Barrel Finish
Carbine Length Gas System
Forged 7075 T6 Aluminum Receivers
Flat Top Upper with White T-Marks
Phosphated 8620 Steel Carrier Assembly
Mil-Spec Chrome Lined Carrier
Carpenter 158 Steel Bolt HPT/MPI Tested
Chrome Lined Properly Staked and Sealed Gas Key with Grade 8 Screws
Carbine Length Polymer Handguard
A2 Pistol Grip
Mil-Spec Sized Buffer Tube
M4 5 Position Collapsible Stock
Black Hard Coat Anodized