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
10 Reviews
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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
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

10 reviews

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Expo Arms utilizes great sources, glad to see the Barrels follow this trend.


Shipped fast(even during the China virus-planned demic). Came in a box and netted sleeve. Clean, Looked great, dimpled, feed ramps, chrome lined, unmarked(from what I saw.) ..Great Fit..All Good... Expo Arms Seems to source from GTG manufacturers and Mil Contractors so I’m not too worried about what I cannot see...

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

Barrel 14.5

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Is everything that I wanted . Good quality and color.

Excellent barrel!

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These barrels are great for the money. Mil spec phosphate outside and chrome lined inside. Group just like my other colt, FN, mil spec barrels..
<br>If you’re looking for a great barrel at a great price give it try!

14.5” Chrome Lined Barrel


This is an outstanding barrel for the money. It shoots straight as an arrow. I have their 10.3”, 11.5” as well. I will be building another 14.5” shortly. Thank PA—- Semperfi

Incredible value


Ordered this barrel on sale earlier this week and it arrived today. Upon initial inspection one of the first things I check is the barrel extension feed ramp alignment with a known good upper receiver. It was absolutely perfect so tried it with another good upper and the alignment was also perfect. So whoever did the machine work on these barrels knows what they are doing from this sample of one. It’s my first Expo Arms barrel and won’t be my last I do believe. Hope to do a followup review later after I get it built and shooting.