Expo Arms Combat Series 5.56 Chrome Lined AR-15 Barrel SOCOM Profile Carbine Length - 10.3"
Note: Due to the Crane-Spec gas port size of .070” this barrel was designed to function both unsuppressed and suppressed with 5.56 NATO pressure ammunition. Unsuppressed use with lower pressure .223 Remington ammunition may not yield the best results regarding function.
- 10.3” Government profile chambered in 5.56 NATO
- Carbine gas system with .070” 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
Ratings & Reviews
Primary Arms is spot on
by Juan -
Outstanding Barrel, Zero issues, used 5.56 and 223. I used iron sights only and it was spot on at 25 yards and 50 yards. I can't say enough about this barrel. Build a MK18 clone.
Buy this barrel!
by Matt -
This is a sleeper barrel.
<br>This barrel is spec'd correctly and install was very snug in 2 separate upper recievers. 10.3" barrel was giving me appx 1.15" moa/100yds with 77gn Match King with Swampfox Arrowhead at benchrest.
<br> Great barrel, I wouldn't hesitate to buy another!
Works great with Russian 55 grain ammo.
by @standingkneelingprone -
Impressive for the price point. Thick heavy uniform chrome bore, heavy park, clean concentric threads.
<br>Gas port is slightly smaller than .070 but that’s a 30 second fix. Gun runs great with and without a RC2 Socom.
<br>Dimpled for gas block, shipped in sealed plastic, soaked in milspec heavy storage oil.
<br>Need a 14.5/13.7 heavy profile next
by D. King
I can smack 8" plate all day long with a red dot. Excellent finish and price.
by C -
Nice barrel Good tight fit in upper haven't shot yet but the other barrels shoot great .
Fantastic barrel and the price is icing on the cake
by Jonathan -
Appropriately gased, dimpled (actually at top dead center unlike some higher end ones I have had), awesome profile, chromed lined and fit snugs in my receiver. Checks all the boxex. This is a case of get more than you pay for or maybe I have just been overpaying before. :)
Build your own Mark18 clone!
by DiggerDave -
Very impressed with the overall quality of the machining and chrome lining. Bore scoped it after running an alcohol patch and the rifling and chrome lining were awesome. Built a Mk18 clone with an adjustable gas block leaving the gas port alone, as is, at .070" and so far so good with 5.56. Will see if it will run ,223. Have not run it suppressed but I can reduce the gas even further if needed. I highly recommend this barrel.
<br>It shoots well and should last longer than me.
<br>So if considering a SOCOM profile with a carbine gas system and .070” port diameter for reliable function, this is a good option at a great price. Caught mine on sale for $80. Thanks PA.