All of my P320s have passed that test, including one 9mm compact that has extraction issues. That gun is on the way back to Sig after choking on WWB, Speer Gold Dot 124 +p, and Federal HST 147 at rate of 3/100 rounds. They were the typical failures you've seen in other threads: spent casing is 25-75% extracted and the slide tried to pick up a new round and feed it under or behind the empty case. Interestingly, that gun extracts robustly with the magazine removed during the test, but it had weak, erratic ejection with a charged magazine inserted. It even hit me in the head with brass a few times.
True story: I called Sig about the problem P320C. The customer support rep said, and I quote, "That's only a 3% failure rate during the break in period. If you send it to us, we'll have the gun for about four weeks and we may not be able to replicate the problem. If that happens, we’ll send it back without doing anything. You may want to keep shooting it and see if the problem goes away on its own." No, I want you to fix the damn gun, thank you. I didn’t ask how long the “break in period” is supposed to last.
I have a working theory that a new slide design may be the fix for extraction problems. That's after reading posts on Sigforum by people I believe are knowledgeable on the subject, and after some recent personal experiences with a few P320C’s. The italicized text below is an excerpt from a post by jljones in a Sigforum thread (page 10):
http://sigforum.com/eve/forums/a/tpc...510039714/p/10.
quote:Originally posted by ensigmatic:
I have been told that most of the guns made after mid 2016 have all the right changes. My new gun was manufactured in September and has been zero issues over about 300 rounds so far.
In one of the P320 threads you posted a list of changes between the first versions of this pistol and later production, but, I'll be darned if I can find it.
quote:
Originally posted by jljones:
The two biggies are a change in ejector cuts on some slides and a difference in slide mass. The newer slides are heavier. For whatever reason, SIG kept trying to make the gun function with an obscure 97 grain frangible round, and went too far the other way to where it caused problems with normal people rounds.
I want to make my own slide so bad that I can't stand it. A true heavy slide with no lightening cuts to see if there is any performance value going the other way. There is a significant difference running a heavier slide on the full size. I just wonder if it poses the same value on the compact.
jljones is Jerry Jones of OpSec Training – Bruce Gray’s outfit. Those guys know a thing or two about the 320. I don’t know if he’s right or not, but his information matches up with my small sample of guns.
Here’s the underside of two recent P320 compact slides. The top slide is the newest iteration that supposedly addresses the FTE issues. It is off of a gun with a manufacture date in February 2017. The bottom slide is off of a gun with a manufacture date of October 2016. The older slide has more material removed and the hammer ramp has a different profile.
Here’s a picture of the extractors. The top slide is the newest version, and the bottom slide is the older version. Notice the newer slide has a scallop cut on the outside of extractor. I have no clue what function that might serve other than to differentiate the newer extractors from previous versions, if there is a difference at all.
The “newer” slide has been functioning like a champ. In fact, I have two compacts with the newer slide. Both are running great without any hint of trouble. The older slide is from the gun that is on the way back to Sig because of failures to extract.
FWIW, I've shot a few of the "older" P320 compacts and never had a problem with them. This is the first P320 that has given my any trouble.