Super dirty brass suppressed AR10 platform

[gf99-99]

I am a long time AR15 owner but have never really dabbled in the larger formats until now. I had an itch to build a 6.5 creedmoor gasser so I finally got around to get it up and running. Took it to the range the other day to sight it in and just see how it runs and everything seems great except the brass is absolutely filthy, with out exaggerating almost the entire casing is black. Is this normal for a AR10 in 6.5??

I have lots of ar15 platforms in 5.56, 300blk, 9mm, .22 and have cans for all of them, yeah the brass gets dirt but this seems excessive. Heck even my suppressed 22 uppers are not this dirty and I didn't think anything could be more dirty then a .22

Now I will admit I was just shooting cheap $20/bx ammo so my only thought is maybe that is the issue??? it was S&B 6.5 creedmoor 142gr hpbt

Firing component are:
Enticer L Ti can
20" BSF barrel
Superlative adj. gas block; I have it adjust so it throws brass pretty much at 3:30-4'oclock, tried to get it undergasses as much as possible.
generic gas tube (don't remember)
JP FMOS bolt carrier
cheapy Aero buffer & spring. I think Aero calls it the "308 rifle buffer" and "308 rifle spring"

I might try and undergas it a little more but I already am almost throwing brass to 4'o clock already and I still want the thing to cycle.

Any thoughts or suggestions, or am I just over thinking it?

 

[Weldor]

They run dirty, you can try a adjustable gas key might help. I run adjustable bolock and key. Some powders are just dirtier than others.

 

[czgunner]

The soot on cases is less about the gas coming into the BCG and more about the suppressor keeping gas in the barrel during unlocking from what I understand. I have a riflespeed on my 308 Stag L and I can't say it has done anything for sooty cases, rather it helps to keep gas out of my face and softens recoil.

Sent from my Pixel 3 using Tapatalk

 

[gf99-99]

Ok thanks for the feed back I guess I might be making mountains out of mole hills.

It's just I have never seen brass come out that dirty be for so it was a little be of a surprise to me. But like I mentioned earlier gun shoot great and cycles perfect so probably not much to worry about.

 

[RockAndSage]

Trying different ammo would be the first thing I'd do, before making any other adjustments. Depending on your application, reliability is usually the most paramount issue, followed by accuracy, so if it's running fine and you're getting acceptable accuracy, it'd be advisable to leave the gun as-is. Trying different loads from different companies will probably turn up some cleaner burning options.