View Full Version : Rusting on new KAC SR15
Hi all,
Put 300 rounds through my SR15 at the range the other day for the first time and it’s a sweet rifle. Didn’t clean it but noticed rust on the flash hider and the gas block. How could this be? Also on the bottom of the flash hider where there’s a hole there seems to be some white crust that formed after I shot it. It breaks off easily with a tooth pick and the “rust” wiped off clean with a rem oil wipe. Anyone have this issue before? My guns are stored in sub 30% humidity so that shouldn’t be a problem. Posting some pics let me know what you think, thanks!
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I'd say nothing to worry about on muzzle device. Hard to tell about the gas block from the picture. I would just use some oil on both. Scrub it a bit with a nylon or brass brush and liberally spray again. I'm not an expert in rust or rust prevention though :)
RAM Engineer
03-07-19, 06:16
I’d contact KAC and see what they say. I get it, if it’s not a big deal, you don’t want to bother them, but if everyone had that mindset, little QC/process controls can get out of control and or be masked.
You should have contacted KAC before posting.
A little residue like you saw on your flash hider is nothing, just a by product of manufacturing/metal treatment/assembly.
Metal will rust after the oil burns off, like your gas block and flash hider, and it it just wipes off with some oil there are no worries.
You kind of need to clean/lube a new gun after you shoot it for the first time. Eventually the metal seems to "season" and is much more tolerant of neglect.
My 2 cents...
To be quite honest I’ve never done anything other than wiping down a rifle just to get off some factory grease before shooting the first time. Never had issues and all my other rifles are spotless. I emailed KAC the pics so I’m waiting to see what they say. I’ll keep everyone posted .
Are you sure this isn't the brown oxide coating they put on the flash hider, gas block, and sight bases?
Jwknutson17
03-07-19, 09:42
The white crust in the index pin install slot is from Rocksett. Normal. If you didn't clean all the lube and crap off the rifle down before shooting it, then its just that burning off. Its not rust. I blast down all my KAC guns with the spray can of rem oil. And they drip that brown assembly/long term oil off the rifle. I would suspect if you didn't clean it down well, you would see what your seeing.
tweakmeister
03-17-19, 15:37
Mine looks the same. Curious to hear if there is a coating on these components. I just hosed them down with CLP.
Just put some oil on a rag and Q-tip and wipe it down and it will be good to go. If I am not mistaken, several of their parts have a patina appearance to them which makes them look like rust when it really isn't. I've seen that patina look on sights and gas blocks. I suppose their could be more.
Looks like discolored, cooked on oil/preservative to me. I’ve seen this before
I shoot mine every weekend. Maybe I should clean and oil mine, seriously. It was so dry and gunked up, I had to pry the CH back and dumped some Frog Lube in it this week. I was so proud of myself.
I wouldn't worry, but you can certainly confirm by phone with KAC what Jwknutson17's explained.
PB
If people would just buy Colt instead of this junky, low quality, non mil-spec Knights Armaments crap they wouldn't have any problems. Might as well buy a DPMS if you're not buying a Colt.
:sarcastic:
KAC got back to me. They determined the overall fit and finish of my upper was poor and shipped me a whole new upper. I’m happy with that especially since it’s a $2500 rifle.
KAC got back to me. They determined the overall fit and finish of my upper was poor and shipped me a whole new upper. I’m happy with that especially since it’s a $2500 rifle.
That’s great to hear. They are so mil focused, it’s good to know they show some civy love.
PB
KAC got back to me. They determined the overall fit and finish of my upper was poor and shipped me a whole new upper. I’m happy with that especially since it’s a $2500 rifle.
That's really impressive. Glad they got back to you.
KAC got back to me. They determined the overall fit and finish of my upper was poor and shipped me a whole new upper. I’m happy with that especially since it’s a $2500 rifle.
Dibs on the crappy one so I can spray paint it!! :p
Saw this thread and realized my SR-15 I purchased in April had the same discoloration on the gas block. 57513
I was told not to worry. Here's their response:
KAC has recently implemented a more environmentally friendly black oxide coating process than previously used processes for some of our stainless steel small parts. This process, while providing the necessary levels of protection to stainless parts, does exhibit a brownish hue/orangish after cleaning and wear. Stainless steel is, naturally, highly resistant to corrosion even in an uncoated state; the use of black oxide is simply to subdue the surface color of the part. A brown coloration on these parts is not indicative of any loss of protective performance or cause for concern.
Saw this thread and realized my SR-15 I purchased in April had the same discoloration on the gas block. 57513
I was told not to worry. Here's their response:
KAC has recently implemented a more environmentally friendly black oxide coating process than previously used processes for some of our stainless steel small parts. This process, while providing the necessary levels of protection to stainless parts, does exhibit a brownish hue/orangish after cleaning and wear. Stainless steel is, naturally, highly resistant to corrosion even in an uncoated state; the use of black oxide is simply to subdue the surface color of the part. A brown coloration on these parts is not indicative of any loss of protective performance or cause for concern.
Good info, and thank you for the update.
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