I just got a P365. Brought it home and cleaned and lubed it right away. I've run 200 rounds of 124gr blazer brass through it, runs fine but the last round seems to be scaring the thingy inside the magazines as it gets ejected. Anyone seen this before, or have any thoughts/ideas. Thanks

Something aint right! I have 20 year old Sig mags with hundreds and hundreds of rounds through them that dont have that kind of wear. I had a 365 but sold it. No mag wear at all after 500 or so rounds.

Just got my P365X with 12 rd mags. Followed the Osage County Gun procedure for the mags. No scrape marks at all on the follower. Able to load 12 rds by hand now with no problems. Are yours 10 or 12 round (standard P365 or X/XL variant)? I'd imagine the procedure's similar. They recommend an Uplula.
https://osagecountyguns.com/si...-365-9-12.html?qty=3

Some Q's:
1) How do you know it's caused by the last round ejecting?
2) Did you use a mag loader initially to get the last round or two in? Did you have to apply an inordinate amount of force?
3) Is it the proper mag loader for the P365?
4) During testing, did you load up the mags with the loader or by hand?

Per Osage, I loaded 11 rounds and let the mags sit for a few days. Have no loader that is designed for the P365. After sitting for a few days, I used a Glock loader to simply push down several times on the mag follower & spring when loaded with 11 rounds. After that, with great difficulty, I could load round 12 by hand. Let sit a few more days. Shot about 100 rounds at the range. Can now load round 12 by hand with no difficulty.

My theory. If you initially used a mag loader that was not a good fit for the P365 and applied considerable force for the last two rounds, that may have caused the scraping. Seems to be located just where the case head would begin pressuring the follower during loading. My impression is that Sig/Osage don't recommend forcing 12 rounds in with a mag loader to start. Same would apply to 10 rounders. Just a guess, need more info.

Welcome to the Forum.

Very good, Nipper

I cannot speak to the 365 specifically but I have seen similar marks on other mag brands, most notably with HK mags, and I have never seen the issue cause any problems beyond cosmetic in my experience.

Not sure if your mag gouges are deeper or rare for the 365 but just wanted to try and give a data point that marks similar to that are not unheard of in pistol mag followers.

Chris

Wow. I just looked at mine. Not quite as severe as yours, but I’ve got the same gouges there. I’ve only loaded by hand.

Although not as distinct or deep as what (I think) I see in your small photo, I have seen something similar with many different magazines. My much-used P320 training magazines all show a small amount of similar wear on the followers.

I believe the blame lies with the ammunition cases and has nothing to do with how the rounds are loaded in the magazine. If the outer edge of the case mouth is a sharp 90 degrees rather than being chamfered a bit that could exacerbate the wear. If that is what’s causing the wear, it should be self-limiting as the groove grows deeper.

quote:

Originally posted by sigfreund:
Although not as distinct or deep as what (I think) I see in your small photo, I have seen something similar with many different magazines. My much-used P320 training magazines all show a small amount of similar wear on the followers.

I believe the blame lies with the ammunition cases and has nothing to do with how the rounds are loaded in the magazine. If the outer edge of the case mouth is a sharp 90 degrees rather than being chamfered a bit that could exacerbate the wear. If that is what’s causing the wear, it should be self-limiting as the groove grows deeper.

I agree. I use nothing but a Maglula on my 365 mags, shoot every week and I'm going on 52 weeks of shooting with no problems like the OP has.

Like many questions here, this one piqued my curiosity to investigate a bit further.

I examined the cases of Blazer brass and aluminum, and Speer and Winchester premium hollow point ammunition with nickel-plated cases.

The edges of the Blazer brass and aluminum cases felt noticeably sharper than the nickel-plated HP ammunition, and the Blazer brass felt the sharpest. I then scraped a fingernail with the edges, and the most noticeable effect of removing fingernail material was again with the Blazer brass; the aluminum case removed less with the same pressure, and the nickel-plated cases none at all.

It seems obvious to me that the damage to the OP’s magazine followers was caused by the case mouth edges. I also believe, though, that it’s nothing to be concerned about over the long run.

Welcome to the forum… stay a while ya might actually like it. What was posted above is solid advice. It is cosmetic only and will not affect the function/reliability of your magazines/handgun. If it concerns you, I would try contacting SIG CS and see if they would be willing to replace the followers/springs.

Awesome responses!
Thank you Nipper for pointing out that sharp line of the case head matches the mark on the follower. I had it in my head that the rear of the last round was doing this, and just never considered any other cause.
I can load these mags manually, but it's not fun. I have cheap makershot speedloaders for my M&P and my Shadow2 and discovered the Shadow magazines are the exact width and depth as the P365, and it's loader works fine so I've been using that. I'm going to pick up a Uplula loader at Sportsmans this weekend, definitely worth a try, thanks for the suggestion.
Also thank you Sigfreund for the idea that the wear will be self-limiting.
A couple people mentioned the small photo, sorry about that. You can click on it to go full size, not sure why it did that. Weird.
I have some Fiocchi rounds (that are almost too pretty to shoot) that I'm going to try this weekend in it, looking forward to seeing how they do with this.
Honestly, thank you all so much. Your insightful responses were WAY more than I was expecting. This is quite a group you guys have here, I'm impressed.

Mine has the same. No problems with function though.

That’s totally normal wear on the follower. All my P320 (M17 and M18) have the exact same marks from the last round feeding - both SIG factory and ACT mags, although the ACT followers look a little more rough (maybe they keep the price down by using slightly cheaper plastic?).

If you look at a Glock magazine, their follower actually has a small rounded “scoop” in that exact spot, presumably to reduce friction / drag as the last round is feeding.