Expo Arms Combat Series 5.56 Chrome Lined AR-15 Barrel Government Profile Mid-Length - 14.5"

Manufactured by Expo Arms
SKU: XP-B-556-145-GOV-C
MPN: XP-B-556-145-GOV-C
Manufactured by Expo Arms
5 Reviews
$129.95 $149.95

In Stock

Standard orders will ship out same day if ordered by 3:30pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



The National Firearms Act regulates the configurations of some firearms assembled with barrels under 16” long. Know the NFA laws in your state before purchasing this item.

The Expo Arms Combat Series AR-15 Barrels are designed to give you a premium barrel at an affordable cost. This AR barrel is made from Mil-Spec 11595E certified 4150 steel and features a chrome lined bore to withstand high temperatures for a long barrel life. This 16” model features a government contour with a mid-length gas system and .077” port diameter for reliable function. Additionally, the .750 gas seat diameter is dimpled for securely attaching set screw gas blocks. The 1:7 twist rate is optimal for heavier 62 grain ammunition and the muzzle is threaded 1/2x28 for your favorite 5.56 muzzle device. The entire 5.56 Barrel is Phosphate coated for corrosion resistance and oil absorption. If you are looking for a combat ready barrel that provides exceptional accuracy and reliability, you can’t go wrong with an Expo Arms M4 barrel.

  • 14.5” Government profile chambered in 5.56 NATO
  • Mid-Length gas system with .077” port diameter
  • .750” dimpled gas block shelf
  • Made from Mil-Spec 11595E 4150 steel
  • Chrome lined bore with Phosphate outer finish
  • 1:7 twist rate and 1/2x28 muzzle thread
  • M4 feed ramps

Expo Arms offers top-quality MIL-SPEC AR-15 components at rock bottom prices. Made in the U.S.A. and covered by Expo’s Limited Lifetime Warranty against manufacturer defects, material or workmanship problems, and even normal wear and tear.
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Barrel CoatingManganese Phosphate
Barrel ContourGovernment
Barrel Length14.5
Barrel LiningChrome
Barrel Material4150 Chrome Moly Steel
BrandExpo Arms
Feed RampsM4
Gas Seat Diameter.750 in
Gas System LengthMid-Length
Thread Pattern1/2 X 28
Twist Rate1:7

Ratings & Reviews

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Expo Arms Combat Series 5.56 Chrome Lined AR-15 Barrel Government Profile Mid-Length - 14.5


Just got mine in the mail today. The barrel looks flawless and fits the upper I have nice and tight. Very pleased with how it looks. Haven't matched the upper to a lower so I can't comment on accuracy yet.


by -

great barrel nice chrome lining outside finish was flawless great packaging
<br>haven't shoot it for accuracy yet but will be buying more of these for future builds


by -

Top quality, fast shipping and accurate, 1moa groups at 150 yards.

Expo Arms 14.5” Barrel

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EXPO ARMS 14.5” 556 chrome lined barrel is the best affordable barrel on the market today. Primary Arms has what I need every time I shop! 🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸

Good barrel

by -

The barrel seems to be great quality, just recently fired rounds through it, seems to be accurate. Like the chrome line, the quality looks really great. Expo arms did a good job on the machining of it. Seems like it will last