Hi there,
I've been carrying my P365 for the last couple of years - love this little thing!
I carry it in my cargo pant's front pocket, tucked inside a DeSantise Superfly pocket holster, the one that has an overlaying flap to further reduce printing.

To my surprise, I noticed that both magazines, just above the base plate (on both sides) developed a few rust spots. Definitely didn't expect that!

Has anyone else experienced this?

I see you are in Florida, and sweating on top of it will push even the most well made stain resistant steel magazines pretty hard.

I'm not sure what alloy Sig Sauer specifies to be used in their P320 and P365 magazines, but it is a night and day improvement on the old Sig P200 series classic mags. One touch of a sweaty finger on one of the old P228 magazines and you can expect a full-on orange outbreak by the end of the day. The P365 magazines are definitely made with some sort of semi-stainless steel, but they aren't completely full proof. Good old fashion carbon steel by far offers the best combination of durability, flexibility, hardness, and affordability(rusting is the downside). Highly corrosion resistant stainless steels are more expensive, and they tend not to have the shock absorption nor the flexibility of carbon steel mags. Sig Sauer it seems picked an alloy somewhere in the middle for the P320 and P365 mags which seems to be a great balance of the two extremes.

Rubbing your pistol and mags down with Tuf-Cloth at night is a good way to keep the rust at bay. That or a light coating of CLP and some steel wool to take the rust off.

I have always rubbed down my gun and or extra mags every night after use before putting up. Never an issue with anything.

So that’s my advice give them a rub down with a tuff cloth or rag with a little impregnated oil etc.

Thank you Fuego220 for the good information! I agree that today's steel used in magazines are better alloys but I was expecting better plating or other type of coating on the exterior.
Nevertheless, your and cslinger recommendation to rub a thin layer on the mags is a good idea - Much appreciated!

No problem with my newer mags. But you could actually watch my original 226 mags rust.

We see it all the time. The finishes used today by factories are not rust resistant.

Keep them wiped down and a good protective coat of oil on them

My experience also living in FL and carrying the P365 over 18 months or so is that I had to wipe down the mags at least once a month to keep them from rusting.

Yep - Florida is great and high humidity is a part of life here most of the year...

I find it interesting that the rust is only along the top edge of the plastic baseplate. I assume that there must be moisture accumulation along that upper edge.

Will definitely wipe mag off and add a thin coat of oil.

Once you clean them up, use some car paste wax on them. I used to leave the wax on and never had another mag rust in my mag holder.

I made a similar post a few months ago:

https://sigforum.com/eve/forum...420016274#3420016274

So I'm glad I'm not the only one.

But yeah, for 50 dollars per magazine, I'm absolutely floored they don't have a better coating.

My sentiments exactly - Jester814!

It's fine oiling waxing etc to avoid rust but we shouldn't have to - not from Sig!

I've had some spots appear around the edge of the baseplate on the 12 round mags but none on the 10's. Last cleanup I put a light smear of Rig grease around the base plate area where the tube ends.

'Made in Italy' or 'Made in USA'?

Yep. I've had some rust spots develop on a few of my P365 magazines, right where the body meets the baseplate.

I've since started wiping them down with an oily rag regularly.


They're only the second pistol magazines I've ever had rust issues with, despite living in the humid South. The first were some blued aftermarket P220 magazines from about 15 years ago. (IIRC, they were made by Novak.)

Man, that's strange. I've been carrying the P365 for 2 years. Mag is USA made. Location is H-town, and that "H" stands for humidity, not Houston. Not rusting problem, so far. And, I don't wipe down the mags once a day, not a week, not even once a month.