Exterior barrel fouling?

[nammyczc]

Hi Guys, need some advice on this. I just built my first ar15 and test fired it and noticed a lot of brass/goldish color on the exterior of the barrel. Tried wiping it off and would probably need solvent to clean it off, is this normal?

.223 wylde barrel 1:8 twist with basic 2 port muzzle brake, toolcraft nickel boron bcg, anderson lower.

I shot roughly 200 rounds of american eagle brass 223 55g.

[Quickdraw559]

Looks like you burned off some dirty lube.

Clean and shoot.

[nammyczc]

Thanks!

[saudadeii]

Is that a .308 crush washer?

[PachecoFTW]

Some gas blocks have the gas tube drilled all the way through and depending on your ammo or gas system that there sometimes happens.

[ThatFishGuy]

Aside from your crush washer hurting my eyes lol, I'd just clean it off and leave a real thing coat of oil.

[17+1]