I would think grip.


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Ooops didnt see last part about grip


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Welcome to SIGTalk.

No offense intended. But since you've replaced the catch and spring (and assuming you did it correctly), this is the next likely cause.

Are you inserting the mags with "authority" or are you treating them like porcelain?
They can have resistance when fully loaded and you have to smack them or lock the slide back and then insert the mag until you hear it click into position.

 

How about some photos? Both of all 5 magazines, of the catch slots, and if you have the old catch, if still around, and the new one.

When you mention you eliminated your grip as the issue, did you reverse it, to make sure?

Do you insert the magazine with the slide locked back? Or with the slide forward?

 

For me, it's my grip when shooting my P229R and P226R, both in 9mm.

My support (left hand) hand's meaty part (aka "Thenar Eminence" or "Mount of Venus") will often depress the mag release. I've tried both the standard SIG screw-on grips and the E2 grips.

I've since reversed the mag catches on these two SIGs and shoot enough to use my right trigger finger to depress the mag catch (as I would with an AR-15, anyway). I suppose I could have filed the mag catch button down, but that would have ruined the checkering/serrations on the mag catch button to some extent.

With my older SIG P225, the mag catch sits lower; isn't reversible; and I don't have the mag-dropping problem.

For the OP, who knows what the problem is as we aren't there.

 

You could put a stiffer spring in the mag catch, i changed a few of mine to go lighter on 1911's but you could do stiffer.

 

My guess would be your grip is inadvertently tripping the mag release during firing / recoil.

 

"Systematically eliminate all the possible causes and the last one remaining is the reason."

Even though you say you "have eliminated" your grip as the cause, it is the only remaining variable left.

 

welcome from az.

 

After inserting magazine, try giving the bottom of the mag a nice strong pull to be 100% certain the mag is fully seated correctly. After chambering a round into the breach, try tugging on the magazine again.

Have another person try firing your weapon. If the other shooter can get through your entire magazine capacity without dropping the mag, it’s clearly user error.

 

Hello,,, glad you joined us!!!

 

Is this a new MK25?

I would agree with others that the most likely cause is inadvertently tripping the mag release. However, there may be an issue with the machining of the mag catch recesses in the frame. A trip back to SIG may be in order.

 

Insert an empty magazine into the pistol. Pull, hard, on the bottom of the magazine to try to remove it. If it stays, you can be pretty sure that your magazine catch is fine.

 

I can pull on the bottom of the magazines and they will not budge, but if i rack the slide back with some force, it will drop the mag. I can fire the pistol one handed with my fingers nowhere near the mag release with the same issues. Handed it off to some friends and they experienced the same. Kinda at a loss, especially with replacing everything. Probably going to find its way back to Sig.

 

Once again PHOTOs would be helpful, even with the slide removed, looking from "above" down through the grip.

Just out of curiosity, does this have any kind of "Magazine Safety"?

 

Just to chime in -- I have a new Mk25 that I bought in May and have had similar issues with Mec Gar magazines. I bought 4 of the 18 round mags from Brownells; 2 of the 4 would fall right out of the pistol if I jiggled it around about (empty or loaded). I wasn't able to get a crisp click from the mag catch while inserting them -- it felt like it the catch was just hanging on by a thread. I've had no issues with the 3 magazines that came with it.

I saw a another post here about someone having similar issues with a Mk25 -- they ultimately sent theirs into Sig who changed the mag catch. I just went ahead replaced my mag catch (its only a $6 part) to see if it made any difference and the 2 mags that gave me trouble clicked right in.

I went to the range and put 200 rounds or so through all the mags I had. One of the two bad Mec Gar mags fell out after about 10 rounds or so -- it bounced off the table I was shooting over and into the firing line. I just left it where it landed when my hour was up. I didn't want to have an RSO call a cease fire over something I was going to throw away anyways.

I got a little excited right after the mag catch replacement and ordered another 4 Mec Gars -- I'll post a follow up when they come in and I can make it to the range.

 

Welcome to the forum!

Curious if the three mags that came with your MK25 are stamped "Made In Italy" in very small letters along a back edge near the bottom. If not, they are US mags from Check-Mate manufactures. If the factory ones DO say "Made In Italy", they are Mec-Gar mags.

Trying to determine if there could be a bad batch of out-of-spec Mec-Gar mags floating around the market.

 

The 3 that came with the Mk25 all say "Mec-Gar made in Italy" (these were all 10 rounders, I have the Mk25-MA) -- the 4 I bought from Brownell's say the same thing. I couldn't find any serial numbers or anything I could tie back to a lot number, unfortunately.

 

I would look to see if there are any differences between the "good ones" and the "bad ones". Any dimensional differences or differences in the notches that the magazine catch engages.

Strange since Mec-Gar mags are traditionally very reliable.

 

It could also potentially be a faulty mag catch. Sig QC hasn't exactly been king over the years.

 

It might be useful to know...

My P226 MK25 drops mags while shooting. Have rotated through 3 factory and 2 mec-gar mags with the same issue. I have replaced the mag release and spring, but continue to have the problem.

I have a new Mk25 that I bought in May and have had similar issues with Mec Gar magazines. I bought 4 of the 18 round mags from Brownells; 2 of the 4 would fall right out of the pistol if I jiggled it around about (empty or loaded).

What the build dates are on these two MK25s, and the serial numbers (to tie the frames to production period).

Do either of these pistols have the magazine safety installed that blocks the trigger action if there's no mag present?

How does the mag catch spring tension feel?

Where did the replacement mag catches come from (supplier & production)?

 

When you insert a magazine into the mag well, watch the mag release button from the side so you can see how much it first moves inward, then as you finish pushing the magazine home, the mag catch should snap outward.

On my carry P229, when I measure the height of the mag button extension,(no mag inserted, measurement taken from frame sidewall to tip of mag release button), it measures 0.137". When I partially insert a mag (and watch the mag button go inward, it measures 0.095". When the mag is fully inserted, the button snaps outward to it's original 0.137". So internally, the release is engaging the magazine by at least 0.042".Never an unintentional mag drop. The figures above were taken with a digital caliper, if you don't have one, they are about dirt cheap and worth adding to one's tool supply. With the actual measurements from your gun, it could well help point to the problem.

 

For anyone curious, i swapped the mag release and spring with a buddies the other day. Worked in mine like a charm with both the mec gar and factory mags. After narrowing it down, turns out it was the spring. So the origional and replacement spring i bought were faulty. Ordered (a third) new spring and it works.

Thanks for everyone's input.

Edit: all additional parts ordered are OEM
Edit2: 47E 002980

 

same thing happened to mine, when using 1993 mags worked no problems new mags dropping?

 

Photos, always help, both of the pistol, and Magazines.

Is there clearance between the bottom of the frame/grips, and the top of the floorplate?

Does this happen both when loaded, with the Slide locked to the rear, and loaded on a close Slide?

More details, always helpful!

 

Or…
Send it back to Sig for warranty repair.

 

Bravo!

I cannot understand why gun owners will pay $$$ for a Sig, Ruger, etc. then feel obligated to fix defects in the delivered product. . Hello! You paid a premium for a high-end product. Fix it yourself? 🥵

I say:

1. Clearly document the problem. Photographs help!
2. Get RMA from the manufacturer.
3. Away she goes! Send it right back.
4. Require vendor to include comments on what was fixed.
5. If not fixed, go to #1.

 

Thanks for the update and glad to hear that you guys figured out the problem.

 

No issues until one Saturday at IDPA practice. Pretty much every time I shot my 226 X-Five Legion, I would drop the mag. couldnt find anything wrong with the gun. Still don’t know how I changed my grip that day but I did. You do have to be aware of your grip in relation to the mag release. As you can easily hit the release without even realizing it. I guess I must have subconsciously figured it out as I have had no issues since.

 

I was able to take both my 226 and 229 to my gunsmith this morning. He swapped the mag releases between the guns and the 226 continued to be able to drop the mags without actuating the mag release. The 229 did not. So eliminated a specific issue with the mag release.

Then in looking at it, we could see that the mag release was sitting further out on the "off" side of the gun on the 226 than the 229. Rather than try any modification to the frame, he sanded lightly the end of the plastic shim that sits down into the frame that holds the mag release in place under spring tension. That allowed the mag release on the "off" side of the gun to sit further down in the frame more like my 229 does.

Tested out the mags and all were very positively engaged now with the mag release and held the mags tightly but also allowed positive release.

Will take it to the range this weekend and see how well it does under recoil, etc, but it seems like the issue is fixed.

Not sure if the frame where it meets the mag release plastic shim was a little off spec, but just sanding a tiny amount off that plastic shim allowed things to function properly so far it seems.

We didn't take any pics but I do wish we had to better explain in case I am not using proper terms here.

Stock internet image below:

 

Range trip yesterday and everything functioned as it should. All mags on the 226 clicked in and held solid until purposely released.

The 229 ran the 17 rounders I got for it with no issues as well as the 226 mags without issue.