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This is a discussion on Magazine Issues within the P365 forums, part of the SIG Sauer Pistols category; A few weeks back I bought a 365 XL. I took it out yesterday for the first time. I put 200 rounds thru it. I ...


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Old 07-12-2020, 05:53 PM   #1
j_p
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Magazine Issues

A few weeks back I bought a 365 XL. I took it out yesterday for the first time. I put 200 rounds thru it.

I have two 15 round mag and a 12 round mag. All are Sig brand. I have a Pro Ledge Base plate from Tactical Development for the 12.

The first time I loaded the 12 round magazine I got about 3-4 rounds in and the spring got wonky and lost all of its spring. The bullets were just laying it in. I got them out and the spring returned to normal. I loaded it probably 5-6 more times with zero issues.

On my 15 round mags: twice I had issues with the base just coming off. Once while shooting. The other time I was just loading. Iím not sure if it was the same mag that messed up or each one messed up. I donít have them marked. Each time was in the first couple of times thru. No more issues the next 2-3 times I shot them.

Iíve heard that the spring on the 365 mags were very stiff. Do you think this was part of the normal break in for the mags? Or should I send them in to get looked at?

Like I said, the all issues were in the first couple of times being loaded/shot. The 12 was the first time. I believe the time when the 15 round came apart while shooting was its first cycle as well.

Thanks for any advice


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Old 07-12-2020, 06:55 PM   #2
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Quote:
Originally Posted by j_p View Post
A few weeks back I bought a 365 XL. I took it out yesterday for the first time. I put 200 rounds thru it.

I have two 15 round mag and a 12 round mag. All are Sig brand. I have a Pro Ledge Base plate from Tactical Development for the 12.

The first time I loaded the 12 round magazine I got about 3-4 rounds in and the spring got wonky and lost all of its spring. The bullets were just laying it in. I got them out and the spring returned to normal. I loaded it probably 5-6 more times with zero issues.

On my 15 round mags: twice I had issues with the base just coming off. Once while shooting. The other time I was just loading. I’m not sure if it was the same mag that messed up or each one messed up. I don’t have them marked. Each time was in the first couple of times thru. No more issues the next 2-3 times I shot them.

I’ve heard that the spring on the 365 mags were very stiff. Do you think this was part of the normal break in for the mags? Or should I send them in to get looked at?

Like I said, the all issues were in the first couple of times being loaded/shot. The 12 was the first time. I believe the time when the 15 round came apart while shooting was its first cycle as well.

Thanks for any advice


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I had no issues with my 12 round mag. I bought a 15 round mag from my local Academy and it fell apart after loading 3 rounds. The follower was catching in a groove. I exchanged it for another one and it wanted to do the same thing, but I didn’t let it happen. I loaded it up for a night and the next day it loaded again fine, I havent shot with it yet though. We will see.
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Old 07-12-2020, 09:55 PM   #3
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There have been instances of burrs inside the magazine housing that the follower catches on. I haven't experienced it, but there have been posts on this forum about that.
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Old 07-13-2020, 03:30 AM   #4
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Why did You change the base plate.
Next time keep everything OEM.
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Old 07-13-2020, 04:00 AM   #5
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Are you sure you installed the pro ledge correctly?.....was it fully seated?
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Old 07-13-2020, 06:34 AM   #6
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I changed the base plate on the 12 round mag. I like the pinky extension. It helps me have a much better grip.

And I could understand how that possibly could be the problem. But I only did it on the 1 mag.

I still have 2 factory 15 round mags that had problems. So even if I had it incorrectly installed (which wouldnít be a surprise for me. But it is on there correctly). That still doesnít explain why I had issues with the OEM 15 round mags with no changes.


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Old 07-13-2020, 06:56 AM   #7
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Your mags probably have small burrs INSIDE the LEFT cutout from the metal stamping process.
The follower is plastic and the left edge tends to snag that left cutout.

Sandpaper the follower a bit just to round over the left side where it contacts the cutout.
Then deburr the INSIDE top and bottom of that metal cutout.
Use a tiny file, diamond file, nail file, exacto knife blade, or any tool that will get inside to smooth over that cutout burr at the top and bottom edges.
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Old 07-13-2020, 02:38 PM   #8
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J_P, how are you seating the rounds? I know it is a wrestling match with a new mag. This is another argument for using a MagLula; it pushes straight down on the follower and the bullet stack.
Moon
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Old 07-14-2020, 06:39 AM   #9
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Quote:
Originally Posted by halfmoonclip View Post
J_P, how are you seating the rounds? I know it is a wrestling match with a new mag. This is another argument for using a MagLula; it pushes straight down on the follower and the bullet stack.
Moon

Iím using the MagLula


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Old 07-14-2020, 04:45 PM   #10
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As others have said, there can be very tiny burrs on the inside of the mag at the cutouts - I had several like this. The worst 2 I returned to sig for replacement. The others I just finger cycled the follower up/down maybe 40 - 50 times to "wear in" the follower. You can see where the follower (plastic) got slightly "shaved". You can also slightly de-burr the mag inside as well. Doing both has made my mags 100% reliable (I have yet to shoot my new 15s though).
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Old 07-15-2020, 04:31 PM   #11
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Sorry to hear you had Magazine issues, j_p.

As others have indicated, the 365/XL mags do seem to need a little exercise at first. For my first two I loaded/unloaded them a couple times first. When I got my next three from Osage, I took all of them apart, lightly went over each follower with light sand paper looking for burrs, then cleaned the bodies out with a very light coat (mostly rubbed off) of Slip 2000 EWL, then reassembled. Iím only at 240 rounds but no issues loading / shooting (I use a Maglula also). Good luck, and I sincerely hope your problems are now behind you.
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Old 07-16-2020, 04:49 AM   #12
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Great tips, I'm going to disassemble my mags and take a look
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