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P226 MK25 stock sights

17K views 22 replies 14 participants last post by  StiflersMom 
#1 ·
I recently purchased a brand new MK25 (prod. date Oct/2018) and have been to the range a couple of times with it. I noticed the POI is low most of the time even when I'm lined up using the combat sight method. I also shoot my Glock 17 at range and I'm not having this issue of shooting low with that gun. I decided to check the sights when I got home and noticed the stock SigLite Night sights were #8 front and #6 rear. I thought that was a little weird since most, if not all standard P226 comes with #8 front/rear sights. I called Sig Sauer this morning to confirm whether the wrong rear sight was installed on my pistol or not and #8 front/#6 rear checks out with their system.

If there are any recent MK25 owners here, would you mind checking what sight numbers you have on your pistol and listing them here? In addition, how are you lining up your sights in order to get a more accurate POI?
 
#5 ·
I thought my rear was #8 at first too, until i took a photo and really zoomed in to see it was a #6 instead. As I mentioned in my original post, I've already called Sig and they told me that on my MK25, it should be #8/#6 but he didn't know what the reason was.
 
#13 ·
Why the hell would they change it?!?!?
Did they change the machining depth of the dovetail to a shallower depth???

My newest MK25 is 2014 (other two are 2013) and all three are 8/8.
Recently installed Trijicon HD 8/8 on the newest.
 
#17 ·
So my MK25 has a #8 front and #6 rear and while I was checking that last night, I also put a laser in the chamber to check POI. The laser hits right at the top of the front sight out to about 30' or so. I was doing this in the house, so thats as far as I checked.

Sent from my SAMSUNG-SM-G930A using Tapatalk
 
#18 · (Edited)
I just remembered something.

I recently made an observation in another thread that SIG didn't appear to be cutting the dovetails as deep as they used to cut them. And I had noticed that on the rear sight dovetails. As far as I can remember, all of my SIGs have some of the bottom of the dovetail showing on either side of the rear sight.

But I've seen quite a few lately where the bottom of the dovetail doesn't show on either side of the rear sight, and in many cases I've seen where the base of the rear sight actually overhangs the top, curved surface of the slide slightly. That was actually the observation I made in the other thread. I am now wondering if that was an adjustment made to the milling of the dovetails to raise the rear sight some for co-witnessing on models equipped with Romeo1 optics. And with the shallower cut, they had to lower the sight number on the rear sight. If they are milling all P226 9mm slides that way, then they don't have to mill slides with two different sight configurations for whenever they make the determination that they want to run some through the other mill to install Romeo1 optics for another order.

But judging from the OP's post, it appears they don't have the POA/POI properly aligned on all of them.

Just a thought from where I'm at which isn't at home with my collection.
 
#20 · (Edited)
Just received my MK25 Thursday May 21 and it has 8F 6R. Has a Mfg date of April 20, 2020 on the case.

First two range sessions at 7yds were very precise but not so much on accuracy. Groupings were spot on but the entire group was about 1.5" to 2" low both times, both times using the combat sight picture. I'm not an expert marksman by any means but pretty darn good with my other handguns and rifles. Going to the internet after the two sessions has me very excited to head back and start firing at 10y. I'm guessing the groupings will come up a bit at that distance. This forum and the FAQ from Sig's website are saying this is somewhat normal. From Sig's website:

My SIG SAUER pistol is not accurate. Why? What should I do?

All SIG SAUER production duty/combat pistols are set up to use a combat sight picture. This is where the front sight completely covers the bullseye of the target. Using a six o'clock (pumpkin on a post) or center mass (half n half) sight picture will result in low impact. SIG SAUER, Inc sights in all non-sporting and non-target pistols for 2 inch groupings @ 10 yards. If you are still having trouble please contact Customer Service for further help and instruction. Please have your serial number ready. There are also very helpful free Internet sites that cover pistol group analysis.
 
#22 · (Edited)
Should also say, these are my first posts and I'm excited for this community of Sig owners and hearing differ opinions and ideas. Many thanks to all!

OK, you have in a sense, answered your own questions, from best I can understand, what you are saying, covering a target at close range doesn't allow repeatability of sight picture, so a "larger group".

First the sights are regulated for Point of Aim/Point of Impact at 25 yards, firing single action, and from a rested position. Normally projectiles will cross your sight alignment, closer to the pistol first, then bullet drop will cause it to cross again, in this case hopefully at 25 yards.

While your quoted sight sizes, of #8 front, and #6 rear, would from a "normal" #8F/#8R installation on a 9mm P226, put you 4" lower at 25 Yards.

While I don't want to send you "chasing" your tail, try sighting it as mentioned above. In this case use your "pumpkin on a post" for repeatability. Measure how far your groups are off. When you've determined that, you have a couple of courses of action. Contact Sig Customer Service, and give them the details of your findings. Otherwise they will likely tell you what I just did. They may tell you to send in in, and give you a RMA, and send you mailing labels and instructions.

The other option should your results be 4" low, from this test, would be to get a #8 rear sight. If only 2" low, then besides the #8 rear, you would also need a #6 front, to compensate. Front sights are 1" per number, rear sights are 2" per number change at 25 yards.

Being "new", I would have Sig do it, on their dime!
 
#23 ·
Sig says the combat sight picture should be used and the gun is sighted for 2 inch spread at 10 yards. If I go pumpkin on a post I’m going to go off the target completely low aren’t I? I thought I understood bore axis but maybe not. I was thinking if they are sighted for 10 yards and I’m a bit low at 7, if I move my target back to 10 yards, all else being equal, my groupings will come up. No?
 
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