BudsGunShop.com - chrome lined

yes it is chrome lined Specs
Magpul SL / N/A / Black
Forged Upper Receiver
7075 T6 Construction
Forward Assist
Ejection Port Door
Ejection Port Door Spring
Ejection Port Door Rod
16" Mid Length Barrel
MIL-B-11595E CMV
Chrome Lined
1/7 Twist Rate
1/2 X 28 Thread Pitch for Muzzle
5.56 Nato Chamber
.750 Gas Block Seat
M4 Feed Ramped Barrel Extension
Mil-Spec Phosphate Coating
Delta Ring Assembly
Mil-Spec Barrel Nut
Delta Ring
Weld Spring
Snap Ring
A2 Front Sight Base Pinned
Front Sight Post
FSP Detent
FSP Detent Spring
Magpul SL Handguard
Black
Mid Length Gas Tube
Black Nitride Inside and Out
Gas Tube Roll Pin
Charging Handle
Forged Aluminum
Mil-Spec Type 3 Coating
Phosphate M16 Complete BCG
Phosphate Coated
Laser Engraved with ST Spider logo
High Pressure Tested (HPT)
Magnetic Particle Inspected (MPI)
A2 Flash Hider
1/2" Crush Washer
Magpul MBUS Rear
Black

No it's mil-spec which is 4150 CMV steel.

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Hi Michael, Yes it is chrome lined Specs Magpul SL / N/A / Black Forged Upper Receiver 7075 T6 Construction Forward Assist Ejection Port Door Ejection Port Door Spring Ejection Port Door Rod 16" Mid Length Barrel MIL-B-11595E CMV Chrome Lined 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 Nato Chamber .750 Gas Block Seat M4 Feed Ramped Barrel Extension Mil-Spec Phosphate Coating Delta Ring Assembly Mil-Spec Barrel Nut Delta Ring Weld Spring Snap Ring A2 Front Sight Base Pinned Front Sight Post FSP Detent FSP Detent Spring Magpul SL Handguard Black Mid Length Gas Tube Black Nitride Inside and Out Gas Tube Roll Pin Charging Handle Forged Aluminum Mil-Spec Type 3 Coating Phosphate M16 Complete BCG Phosphate Coated Laser Engraved with ST Spider logo High Pressure Tested (HPT) Magnetic Particle Inspected (MPI) A2 Flash Hider 1/2" Crush Washer Magpul MBUS Rear Black