taadski

Disregard. I found a google image good enough to establish it's the newer spiral pin as expected. http://www.topgunsupply.com/sig-sauer-firing-pin-positioning-pin-current-p-series-spiral.html

Given the LDC is a newer Sig model, I'd bet it'll be the spiral pin. If ya post a photo, I can tell you which it is definitely. And then get ya a number.

Print a bunch of classifiers, use one of the classifier calculators, do the HF math and take a look at the numbers required to make the GM cusp. There's your barometer.

Borrow some ammo from Luke and shoot your open gun. Oh, wait....

I don't believe not having the bosses was what caused the failure with the Trijicon, FWIW. Specifically because I know a number of folks that have had identical RMR issues despite running them with bosses from multiple vendors. (shrug) Who do you recommend as a smith doing this type of work?

Just FWIW... I had a Sig 226 milled for an RMR very early on. No bosses. I'm not competing with it as I'm still focusing on production; more just vetting it in concept. I'm pushing 10K through it. And aside from having one RMR go tits up, I've not had any zero issues. Mine does have the support of some rear slide left as I had them leave the dovetail in place for suppressor sights. Just sharing *my* mileage. t

Cool. Just checking.

To throw another factor at you, some companies list the sight dimensions including the height of the dovetail (again, like Ameriglo IIRC) and some list them as only the blade height. This can obviously cause issues to the consumer too.

Just as a heads up, some of the aftermarket companies making "8/8" sights aren't the same height as stock Sig 8/8 sights. The overall point of impact will (or should) be the same, but IIRC Ameriglows, both front and rear, are taller. So it can be a problem if you're mix and matching. Again, just FYI.

Shoot the 320 and see where it prints for you, then make your decision. Some of the 320s were coming from the factory shooting a bit high. The #6, being the taller of the two factory options, I suspect was to help alleviate that. But regardless, it's going to come down to how YOUR pistol prints. And what projectile you're planning on using, etc... My 320 prints at the top of the front sight with 8/8s with a 124 grain bullet.

Adding the trigger kit by itself made a HUGE difference in my 320 full size.

Interesting. I actually find the medium 320 grip very, very similar in both shape and size to the classic P series pistols with stock grips installed. I find them pretty analogous. (shrug)

That pistol was a work up concept that was put together for SHOT. Reports are that there was some drama at the mother-ship b/c it didn't jive with the modularity concept of the 320 series. The 320 X-5 IS the production release of the "320 Target".

To answer my own question... From Bruce on Bookface... "...full cross compatibility with the 320 family, accepts our new Grayguns Inc trigger upgrades." https://m.facebook.com/story.php?story_fbid=1403398236346423&substory_index=0&id=100000287793289 That's pleasing.

And compatibility with current FCUs too? I know there was some drama re this point and it was reportedly one of the elements that delayed things this far.

A number of our local/regional clubs have been using http://www.tridentstagedesigner.com for the last several years. It's a virtually endless resource for pre-designed stages and a good interface for designing your own. Well worth the $10 investment. t

Turned you down in that they won't send them to non-armorers or something, or that they just don't have any?

Try contacting Robert at http://www.thesigarmorer.com. I understand that at one point at least, he kept these in stock or was able to fabricate replacements. Grayguns is another resource. Although I believe Bruce's versions require fitting. Which segues into shop time and his notorious wait list potentially. Numerich, TGS, Brownells and Midway all are out of stock it would appear. Have you tried calling Sig directly to see what they might have kicking around? t

Sig offered an upgraded P320 trigger to remedy some of the trigger pinch issues folks had. But that didn't have a flat profile. I've not seen a flat trigger released on a production model 320 (yet) and was under the impression they were limited division territory only.

FWIW, the primer tube clips work as an adequate stand-in if you're in a pinch.

This might be your best resource: http://www.sigsauer.com/upFiles/CmsContent/documents/OwnerManual/P226X5OM.pdf

Unfortunately a strikingly poor iteration of one fraught with issues.

How long are you loading them? I shoot 124 Berry's FPs but I load them pretty short to avoid them hanging up on shorter chambered guns. Mine run fine in a 320 FS I own. I'd suspect extractor/extractor spring assuming your rounds pass the drop test in your barrel.

Standard Sig sights (#8/#8) are both .160 tall. While every gun is different, they have a tendency to print "behind the dot" for me. That is, they shoot a few inches low at 25 yards if you're used to a "tip of the post" hold. If you're ok with that, Ameriglo makes a suppressor set that prints similarly. Front and rear are both .350 tall. They will clear your can and get you into the window of your RMR. I have a set on an RMR'd 226 and they work well as a back up sight.

FWIW, 15, 18 and 20 round 226 magazine bodies are all the same size. The follower (and base pad in the case of the 20) is what creates the extra room.