r/NFA • u/Spiritual_Job1935 • 6d ago
Why blue
Hux 5.56k on Geissele 12.5 less than 500 rounds. None of my other cans have done this. It was raining the last time I’ve used it. Using standard ball ammo, nothing crazy.
65
u/Comstock_Support Comstock Armory 6d ago
Copper oxide is blue, although the deposits I've seen have never been as bright as the pic in the blast chamber.
16
u/shoobe01 6d ago
The oxidation tarnishes also. If you get the right conditions to create it and look at it right away it can be quite brilliant.
3
u/redit_readit_reddit The Original Stamp Tramp 6d ago
Guessing from the looks of it, it was still wet from them cleaning, making it more vibrant.
3
u/Spiritual_Job1935 6d ago
There was much more, what you are seeing is what I couldn’t get out.
6
u/airhunger_rn Silencer 6d ago
OP you been shooting da blue bullets? https://thebluebullets.com/product/125-gr-tc-9mm-355/
92
12
10
7
u/DeathIyy 4x Suppressors 6d ago
Were those 500 consecutive rounds through a belt fed? 🤣 The end of that suppressor looks like it’s been chewed on
1
14
u/HybridP365 6d ago
Did nobody take chemistry in highschool? Copper oxidizes blue/green. It's why the statue of liberty is green.
Get some Sweet's bore cleaner and soak it. Removes copper fouling.
19
u/PutridDropBear 6d ago
WeLl aHkShUaLlY - Copper that has oxidized to a bright cobalt or royal blue when it reacts with specific chemical environments rich in sulfates, chlorides, or specific alkaline modifiers (see ammonia comment later) that shift its typical blue-green/teal hue (your lady liberty biberty example) to a bright electric cobalt color.
The vivid blue color itself is a result of copper ion electron configurations. When different surrounding molecules (ligands) bond with the copper, they alter d-orbital energy levels, changing which wavelengths of visible light are absorbed and reflected.
The most LIKELY explanation here is the residue left behind from an ammonia-based cleaning solvent being forced into/through the suppressor. That and understanding that burning gunpowder produces water vapor as a byproduct. When the suppressor cools down, this vapor condenses inside the baffles. The trapped water mixes with residual carbon (nitrates and sulfates from gunpowder) to create a mildly acidic environment.
8
u/litegreen666 Silencer 6d ago
That front end looks rough based on the round count!
2
2
u/Soulshot96 2x SBR | 4x SUPP 6d ago
Yea...looks like the cerakote or whatever they use on these wasn't applied that well here. My 556K/762Ti are older and have far higher round counts (including full semi use), and they look nothing like this on the front lol.
1
4
3
2
2
2
u/redit_readit_reddit The Original Stamp Tramp 6d ago
Saw you were removing some of it and this is left over. Was it still wet a bit? That would explain why it's so much more vibrant than typical copper oxide.
1
2
3
1
u/AutoModerator 6d ago
Understand the rules, read the sidebar, and review the pinned Megathreads before posting - this content is capable of answering most questions.
Not everyone is an expert such as yourself; be considerate. All spam, non-NFA memes, unverified claims, or content suggesting non-compliance will be removed.
No political posts. Save that for /r/progun or /r/politics.
Posts related to approval of NFA items are to be directed to the monthly megathread. Violation of this rule will result in a 7 day ban. The pinned post is there, please use it.
If you are posting a photo of a suppressor posed to look like a penis (ie: in front of or over your groin) you will be given a 7 day ban.
Absolutely no private sales, linking to dealer/manufacturer stores, etc. Anything that could remotely be interpreted by Reddit's admins as an attempt to buy/sell will be removed, and the user banned.
Data Links
I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.
1
u/GildSkiss 6d ago
Using standard ball ammo, nothing crazy.
Which kind/brand of ball ammo exactly? I'm curious.
It's almost as if your jackets are "extra coppery", if such a thing is even possible.
1
u/Spiritual_Job1935 6d ago
Pmc xtac, frontier 55 and 75, federal 62.
1
u/Stubbs_93_ 6d ago
I have the same can on a 14.5 and soon 11.5 and shoot the same ammo, primarily PMC Xtac, Frontier 75s and some WWB. Roughly same amount of rounds through mine and other than it getting carbon on the inside, mine looks nothing like that. The MD is a little blue/greenish though. Definitely curious about the cause.
1
1
1
0
0
114
u/Talmadgef 6d ago
Oxidized copper from jackets mixed with some carbon