Expo Arms 5.56 NATO Chrome Lined AR-15 Barrel - SOCOM Profile - Carbine Length - 10.3"

I built a MK18 upper with this barrel and I am still undecided on whether or not I will keep it or replace it with a Ballistic Advantage 10.3 or a cut down Colt barrel. I've done two range trips with this barrel and have yet to get it to print a decent group. Using a red dot with a 3x magnifier I have been able to get around 4 to 4.5 inch groups at 50 meters. I use 50 meters as my usual red dot zero for carbines and have shot a mixture of M193 (55 gr), M855 (62 gr), and some Aguilla 62 gr FMJ. I have also had some cycling issues, both suppressed and unsuppressed, and have attempted to remedy this by changing buffer springs and various buffer weights which has me concerned about the actual gas port size being what the barrel is advertised to have. I don't want to label this barrel as a lame duck yet, so I will conduct some more T&E and follow up with my final assessment. RLTW!!

Nice to speak with you on this issue, please let us know if you would like to return that barrel. So we can get you taken care of.

Accuracy is much better than expected. A very good option for a regular use SBR. Chrome lining is heavier than most, which came as a surprise. Had it for about a year and it's been great.

looks good, as advertised. Haven’t finished setting it up. Reasonable price.

The barrel is sub moa and hits silhouette at 300 yards with M193. Needed to run a standard weight carbine buffer and spring to get it to cycle flawlessly, after 60 round break in. Very pleased.

This was bought to have in the event that our trying to be communistic government actually gets there way . I have a few acquaintances that have these on suppressed platforms and they seem to do quite well. Can't beat a competent barrel at a good price.

Bought this on sale for a pistol build. I’m definitely not disappointed. Shoots great and accurate.

I've had sometime to thoroughly test and break this barrel in and I can say that, after some trial and tribulation, that it does indeed work as intended. It now has around 300 rounds thru it and is working well. For my setup I had to take out the SpringCo blue spring and the H2 buffer and use a standard spring and a H1 buffer. Now the weapon fires both suppressed and unsuppressed without any issues. The groupings are a little tighter than before, but it is a 10.3 inch barrel so I should know better than to expect sub MOA at 100 meters. I trust this barrel and would buy another Expo Arms barrel again.

Great bang for your buck. Hard to beat chrome lined goodness

This barrel is a sleeper for sure. I've been hammering away with it on a MK18 clone upper. I thought it would add too much weight but it isn't bad. I was mainly using it as a burner and then replace but dang it's super accurate and doesn't heat up as bad and has proper dimple and gas port. It's a exact clone of the socom profile. The 10.3 was always hard to find and it's priced good. Nice!

Heavy and excellent finish