First time running this NIB mag (15rd), it failed... The base plate separated from the mag, dumping the spring, follower, and all the remaining rounds.

I was a little surprised. I didn't tinker with the mag, switch out anything, etc.. The mag was sealed in the box. This was factory Quality Control fail.

https://youtu.be/T8LohOUb1sU

Call factory and let them send you a new one.

Btw, can you determine what part failed? A cracked base pad that gave way?

While I'm not looking to call BS on your story, I do take issue with 1 statement you made.

quote:

The mag was sealed in the box

I currently have 8 brand new in package P365 series 15rd mags in my gun safe. None of them have any type of "seal" on the packaging. These were bought locally at 2 different gun shops. Anyone can open the package, monkey with the magazine, and put it back without anyone knowing.

These mags come with base pads for the standard P365 and for the XL. Maybe someone opened the package prior to you purchasing it, did some swapping back and forth with the base pads, didn't fully seat it, then you loaded it and fired with the results seen in the video?

Just throwing it out there as a possibility as I have a total of 16 of those mags, like I said 8 are still new in package, the other 8 I use and have had zero issues with them.

quote:

Originally posted by sigarms229:
While I'm not looking to call BS on your story, I do take issue with 1 statement you made.

quote:

The mag was sealed in the box

I currently have 8 brand new in package P365 series 15rd mags in my gun safe. None of them have any type of "seal" on the packaging. These were bought locally at 2 different gun shops. Anyone can open the package, monkey with the magazine, and put it back without anyone knowing.

These mags come with base pads for the standard P365 and for the XL. Maybe someone opened the package prior to you purchasing it, did some swapping back and forth with the base pads, didn't fully seat it, then you loaded it and fired with the results seen in the video?

Just throwing it out there as a possibility as I have a total of 16 of those mags, like I said 8 are still new in package, the other 8 I use and have had zero issues with them.

This is a fair point. It wasn’t shrink wrapped or “sealed” per se. The scenario you mentioned is plausible.

I’m not trying to throw shade on Sig or gain some weird sympathy with my post or the video…. Just a crazy experience (one I’ve never had in decades of shooting). At the time of loading the mag, I had given the entire thing a “once over” and didn’t notice anything out of order.. but then again it’s possible I missed something.

After the explosion, I reassembled the mag and dumped another 15 rounds through it without issue.

quote:

Originally posted by InLoveWithSigs:
...At the time of loading the mag, I had given the entire thing a “once over” and didn’t notice anything out of order.. but then again it’s possible I missed something.

After the explosion, I reassembled the mag and dumped another 15 rounds through it without issue.

I just took a look at my P365 15-rounder, and I think this is what happened, and the only way it could happen, based on what you wrote.

If no one had tinkered with the mag, after it left the factory, the person who assembled the mag originally (this would be Check-Mate, and not SIG) did not slide the base plate into the mag correctly. The metal catches on each side of the bottom of the mag body have to slide under the corresponding rails on the polymer base, in order for the whole thing to be secure. The person who assembled it slided in the base plate, but the metal catches sat incorrectly above the rails, so there was nothing to firmly secure the base plate to the mag body. The only thing that held everything in place was the tight enough friction of the base plate wrapping against the mag body. You would not have noticed it with the "once over", because everything looks like normal externally. Once you loaded the mag and started shooting, the jarring force eventually caused the base plate to slip out from the mag body and everything to come out. Then, once you reassembled the mag correctly, there was no further issue.

I'm sitting right here with the mag installed incorrectly on purpose, and everything looks totally normal. The friction alone between the base plate and the mag body is holding everything together. But, I know that if I load it and start shooting, the same thing will happen to me that happened to you.

Btw, you should blame this on Check-Mate and not SIG like you did on your YT channel.

Question. Did the magazine fail, as in not able to be reassembled in any way or did it simple self disassemble?

The reason I ask is that if its the latter then it was probably just misassembled at the factory. If the former then there is some kind of QC or materials issue at play and thats a different level of issue severity IMO.

I had a Colt 1911 mag spontaneously disassemble many years ago and that was a problem……since the floor plate was WELDED ON!

We just took back a return of a 15rd P365 mag that the customer claimed the same scenario. We gave him another 15rd mag in exchange. I wasn't a part of the return but according to the manager who approved the exchange it did seem like the extended base plate was probably installed incorrectly at the factory, which would've been at Checkmate (made in USA is clearly stamped on its side, according to the boss). There was no visible damage to either mag body or base plate. I suppose we could've just installed the plate the proper way but the customer "didn't trust it anymore", so we let him have another.

With so many of these things being cranked out by the thousands, an 'oops' is bound to happen every once and a while. That's why we take these out and use them, to see if they work like they're supposed to.

quote:

That's why we take these out and use them, to see if they work like they're supposed to.

This in spades!!! In my experience most issues with a firearm or part will make themselves known fairly early on. So if new folks are reading this, this is a great example of why you need to bring your gun out for a shakedown cruise or three and not just throw it in a drawer and rely on it. (Not that you shouldn’t be training or practicing period of course)

I had a P320 mag do that at the range, during a steel match. I was at the bench, loading, when it happened. I believe the baseplate wasn't fully on.

What happened in the video obviously shouldn't have happened, but most likely it was not properly installed, as opposed to a mechanical defect.

I've seen something similar happen on Glock mags, too. Usually when they pop apart like that, it's dropped on a hard surface, with an aftermarket base plate, with a loaded mag.

I'd be leery of the mag after that happened to me, but if not comfortable, contact Sig. If you have had success with it and can verify function now, maybe keep it and run it for a while, see how it does.

quote:

Originally posted by cslinger:

quote:

That's why we take these out and use them, to see if they work like they're supposed to.

This in spades!!! In my experience most issues with a firearm or part will make themselves known fairly early on. So if new folks are reading this, this is a great example of why you need to bring your gun out for a shakedown cruise or three and not just throw it in a drawer and rely on it. (Not that you shouldn’t be training or practicing period of course)

And to add another layer to this, this is also why you carry an extra magazine or two when CCW. You may not need the extra ammo, but you need to prepare for any potential magazine failures.

quote:

Originally posted by sns3guppy:
I believe the baseplate wasn't fully on.

That of course is a most likely explanation if the problem never recurred.

It should be possible to troubleshoot something with such a simple mechanical design as a pistol magazine to detect if there is actually a problem with the unit. If the magazine “disassembles” itself out the bottom, then there is obviously a problem with the floor plate or possibly the insert that keeps the floor plate on. If we examine those parts and test them by tugging and twisting and test firing after ensuring they are installed correctly and no defects are found and the problem doesn’t happen again, then the only logical explanation is that something wasn’t assembled correctly in the first place.

Update:

I continued to use the gun and mag (without issue) and eventually (recently) switched my CCW from a G43 to the P365.

I have never had this problem. But, when I get new mags, I disassemble them and clean them. There is always a little factory gunk somewhere in these things. So, my process makes sure the mag is assembled properly before shooting.

My new 365 12 rd mags are marked "Made In Italy".

quote:

Originally posted by InLoveWithSigs:
Update:

I continued to use the gun and mag (without issue) and eventually (recently) switched my CCW from a G43 to the P365.

Thats a helpful update, I'm glad it wasn't defective.
My dad had bought a new Ruger Security 9 that emptied it's magazine contents on the range ground on the first(attempted) shots.

I loved that he called it an "explosion". You want to see an explosion you should see my bathroom after the puppy discovered Toilet Paper.

I've had 1 - 10 rd made in USA, 1 - 10 rd made in Italy, 13 - 12 rd made in USA, and 2 - 15 rd made in USA P365 series magazines and not a problem with any of them, except that one of the 12 rd magazines had a spring that was considerably weaker than the others, but still functional.

I'm a bit obsessive compulsive, so I always disassemble the magazines, clean them, and lightly relube them before the first use.

But having worked in manufacturing for most of my career, I can tell you that if there is a way to improperly assemble something an assembler will find a way to do it. Plus there are those Mondays after a long weekend, and Fridays when they just can't wait to get off of work for the week.

But for what Sig charges for a magazine, they should be perfect every time!

I bought an additional 10 rd from gunmag warehouse and it was made in Italy. I bought a 12 rd direct from Sig and it was made in the USA.

The 12 rd mag came set up for the XL and had to have the extension installed. It was quite difficult for me, even though several Youtube video make it look easy. A neighbor is a retired mechanic and he helped and even he had a bit of a problem holding the spring in place.

This message has been edited. Last edited by: maxwayne,

quote:

Originally posted by maxwayne: The 12 rd mag came set up for the XL and had to have the extension installed.

I have both a P365 and P365XL. But I wanted to keep the 12 rd magazines interchangeable and not need to swap the floorplates. So I used the P365 12 rd spacer and shortened the underside of the spacer until I could just slip it over the magazine with the 12 rd floorplate. Some of the spacers were a bit too loose fitting, so I used a soldering and touched a few areas inside of the spacer with the soldering iron tip to melt and raise the plastic slightly. Now the spacers will slip on but stay firmly in place for use with the P365. I can just remove the spacer to use the magazine with my P365XL.

I took the magazine to the range yesterday and could only get 3 rounds in it. Something must be wrong with the spring or the installation?