P320 - PRE v. POST UPGRADE ANALYSIS 

Man you are simply gifted in mechanical engineering. To look at this stuff, understand it, and then present it in such a clear manner. Really impressive

Nice video! and folks, that is why the updated version of the p320 and the new p320s are not going to go off in your holster by accident. That trigger has to move for that gun to go off, and the video is very professionally done. Thank you

Thank you. An intelligent, coherent source of information is difficult to find. You’re an incredible teacher.

15:15 A possible explanation as to why Sig reduced the sear's vertical ledge was to keep sear/striker engagement more consistent. Unlike hammer fired guns which have all relevant engagement surfaces fixed to the frame (and therefore fixed relative to each other), striker-fired guns have to account for the slop between slide and frame as well as the striker's play within its channel. So every time the slide moves forward and the striker touches the sear their engagement may be slightly different from the last. This is why when adjusting overtravel on a striker fired gun it is important to push the slide down towards the frame while testing to make sure there is enough travel to achieve break even when engagement between sear and striker are at their maximum. By getting the striker's leg to touch the base of the sear, Sig limits how far down the striker's leg can go, ensuring that the contact area between the striker's leg and the sear's ledge has less variation, in turn leading to a more consistent trigger pull shot-to-shot. At least, this is my (somewhat) educated guess. I just came across your channel. Your presentation, explanations, and attention to detail complete with measurements are fantastic! I do hope that you consider covering aftermarket trigger parts like those from Grayguns and Apex and show how they differ from OEM. In any case, keep up the great work!

I have been scouring the Internet for exactly this level of information. Thank you for your time and effort.

Your work/dedication is phenomenal. You are very appreciated. Thank you so much

Wow this is way more education and in depth than i thought it would be…. And it is EXACTLY what i was looking for. This has made me confident in my purchase and really helped teach in depth in an understandable manner. Fantastic work

Such a great detailed breakdown an informational piece. Much appreciated!

Wow, can I just say I “like” a video every now and then. As far as channels I am subscribe to, there are very few. Your channel has just been added to the list. In-depth and educational is an understatement. I had a lot of concerns about buying this pistol. The knowledge I easily acquired through your videos has put my mind at ease and secured my decision. Thank you.

16:20 amazing footage, I can't believe you were able to show the trigger action that clearly

This video is absolutely invaluable with all the current controversy surrounding the Sig p320.

Thanks so much for the deep dive into this. Super informative.

Chefs kiss. Bravo. Beautifully done

Thank you! This video is one of the best that I've ever seen on a firearm topic.

Fantastic explanation and visuals. Thank you.

Thanks for putting this video out. It definitely has put my mind at ease to edc my P320. Bravo! 👏

Thank you for the in-depth video. I just switched to all SIG and the drop issue had me somewhat concerned. But in watching your video and in taking apart my own guns to clean I realize now that it appears that they fixed any issues, again thank you.

Great video. You also have a very pleasant voice, which aids in understanding the differences in the FCU’s.

Great analysis...just what I needed.

I just recently found your channel after hours researching about the drop safety issues with the P320 line. I have a used P320 X-Compact on layaway for me and now that i know what to look for, I can definitely find out if i need to do the upgrade or not. I can't thank you enough for your easy to digest video! I just subscribed to your channel, now that I'm finally getting onto the SIG bandwagon. Thank you again!

Another excellent vid.

@10:20 I think they changed the striker safety lever design to remove any possibility of the trigger safety lever somehow "bouncing up" and allowing it to contact and disengage the striker safety. Now it is strictly a function of the trigger's position. In other words, the trigger HAS to move rearward for the safety lever to move upward and contact the striker safety.

Awesome video, especially the simulation part!

Fantastic vid. Thanks. I pulled my post-upgrade version out to follow along. 😄

Great video. Informative and helpful. Buying my first P320 soon (used). It has not been upgraded, but I plan to have it done as soon as I can. Subscribed and liked.

Best video on the subject ever.

Great video! I purchased a sig P320 x compact that was used but never fired. Dealer said it was likely "new old stock." I had remembered hearing about the drop issue on the 320 years ago, and wanted to make sure my pistol was manufactured with the revisions. Due to your video, I was able to confirm it has the revised parts- Thank you!

I just bought my P320 M18 today and all of these videos you have uploaded are definitely gonna help me a lot! Going from a Glock to a Sig is definitely a change.

15:00 it seems clear that the striker now interacts with the base of the sear so that it can't be rotated laterally as easily, because the ventral face of the striker hits the dorsal face of the sear. Seems like a smart change to me

I’m very excited. Will be starting my first P320 build off the Custom FCU. Your videos are awesome

Excellent video and explanation of the "upgraded" version. Just purchased a NIB P320 circa 2017 and the serial number came back as Not Required on the Sig site. I wanted to know the difference between pre and post models as I like to know how my firearms work and your video explained it in a very detailed way. Great job and you have earned yourself a new subscriber 👍

Nicely done!! Perhaps a future vid could cover the differences between the 9/.40/.357 and the .45 FCUs.

Thank you for explaining I just got my P320C a month ago so I feel like I don't have to change it thank you for professional review asome job!!!

Wow good video, great videography! Thanks much.. Just subscribed! 👍

Such a great video!

Great video, I don't usually comment on instructional videos. This one was explained very well and having the camera focused on the part in particular was very helpful as well. I have a new P320 DH3 and was curious how sig fixed the problem. This has me feel confident that my pistol won't go off unattentionally. Thank you for the good explanations and knowledge I appreciate it.

Incredible and very well done video. Thank you!

Wow what a fantastic and proffessional video!

Loads of data… well thought out and presented! Thanks.

I am going to start modifying my p320 based on this video. Thanks for layout general ideas and roadmap for improvement.

You’ve answered my questions and concerns and now I have neither. Thank you for your time and the presentation liked and subscribed.

These vids are fantastic

Another excellent video.

You’re doing good, great presentation… good for you on the rep for your channel. You deserve it. Videos well thought out and presented. I see you may have gotten some other new things besides the pre-update FCU. You’re going to hafta polish up this one. I see some sear housing holders… nice touch!!! One question, will the pre-update FCU work with new parts??? Good luck… glad to see your work is recognized.

Excellent work,, as usual ..

Very good information. Also not all needed the upgrade. Mine was sent back from them stating that. My slide is different from both you're showing. Mine is chambered from factory .357sig. My 2 9mm did get the upgrade. which had those slides you were showing.

Simply fabulous. 👍

Hey you just sent me the link to this video. I really appreciate that. Unfortunately I don't have the time to go through it right now. I will here in a day or so. Thanks again for your help!!!!

Great video! I just purchased a P320 Spectre Comp as my new EDC (after training with it I will carry it) and this video was a great source of information!

Great presentation!

Very interesting. I got into Sig chassis guns when they released the P250. I was a great gun if you were used to revolvers since it had a long trigger pull, but it was smooth as butter for a hammer fired gun. One of the selling points of the gun, over the other manufacturer's striker fired designs, was the ability to pull the trigger another time in the event of a light primer strike. "Second strike capability", I think they called it. It looks like the intention was to carry this over into a striker fired chassis format. I even remember the early P320 ads mentioning second strike capability. It appears that they fully dropped the entire concept with the P320 redesign and the term has entered the dust bin of history.

Excellent explanation 👍👍

I have an upgraded and a non- upgrade FCU. I carry the original with full confidence. I personally feel the drop issue was overblown. The 320 is an excellent weapon regardless of which FCU you have. Can't beat the modularity. I've written a few articles on this fine weapon. I'm a 1911 guy first and foremost.

Love your content. I remember nearly a decade or so ago when Sig was reinventing it’s brand, they said that the stopped thinking of themselves as a firearm company and instead started thinking of themselves as an engineering company that happens to make firearms. It seems like they were being truthful with that statement. They are constantly analyzing their designs and making improvements to their products. People like to hate on them by saying that they use their consumers as beta testers for first-gen products, but I don’t believe that’s their intention at all. When issues do arise, they address them, and also incorporate additional changes that aren’t related to the issue they’re addressing but that make their design better. I actually own a pre-upgrade P320 that I never sent it. And I don’t plan on ever sending it in. Thanks again, for your content; I really enjoy videos!

Your photography/videography is excellent! AMD, I like the grayscale.

My 320 was bought a few months ago and I didn't know anything about the pre vs post upgrade crap and had to send mine in

This is awesome!

...this video cleared some things up for me... :) I was second-guessing getting a 320 before as I did not understand its internals. Now I do. Others just film the gun lying on the table, rambling about how unsafe it is but that they still like the gun. Here I am not given the opinion, but rather the facts, leaving me to build my own opinion... Please keep going! 😎

The tab sticking up on the right side of the pre upgrade frame, was a carryover from the p250 firing pin blocker, when the slide was out of battery.

Thank you learned a lot excellent video.

I am so glad you have made these videos. I am in the process of building a 320. I am starting out with a bare fcu. I was wondering if all of the post parts will fit it. I would hate to order all of the fcu parts and have them not work. This is my first SIG build. I've built many glocks and ar15's so im not new to building gun, just new to the SIG's.. Thanks again for your time to make these videos. They are a huge help.

It's crazy I thought it was a simple fix, but they really went through the design and changed alot of things. They wanted to make sure, there was no issues in the future.

One of the biggest reasons the Sig and the S&W M&P will fire quicker and accidentally is because the are basically “Single Action”. The firing pin is cocked back under spring pressure. Once you touch the trigger, with very little pull and travel distance the firing pin is released forward. As compared to Glock style trigger safety on various other manufacturers, the trigger will not allow the firing pin to be released so quickly and also specifically the Glock, it’s a “Double Action” gun, the firing pin is set forward. You would have to release the Trigger safety and then pull the trigger back enough to cock the firing pin. This is one reason the triggers on Sig and M&P are lighter and quicker because of the reduced safety and travel distance. Something to keep in mind when you carry and fire these different guns.

Awesome video! By far the best video explaining everything one needs to know about these issues plaguing the P320. My question: is the Sig P320 M18 (the one in flat dark earth and with manual safety) post updated? Thank you! New subscriber from 🇵🇭

I have to be honest, my previous request for you to compare operational similarities between the P320 & P365 were completely for personal vindication… I was in a deep debate with someone on one of your videos about the P365 having basically the same mechanics. Mainly about the striker safety lever setups. They’re basically the same except one is built into the striker itself and the other is a stand alone. Otherwise, they work the same exact way. Even the sear engagement with the striker and how it’s reset and released. Anyway, again… great work

I bought P320 RX compact when they came out. Shot few boxes through it then I've put gray guns flat face trigger in it, shot another few boxes but for some reason I've never fell in love with it. Never send it to Sig because I've misplaced stock parts and on a top of that I would have to get new version of trigger from GG. Still sitting in my safe waiting till I make my mind what to do with it..... One day. Lol

All I know is I took advantage of the upgrade and am glad I did. I have no idea, As I know for fact some people did not bother. One person said "If it is good enough for Sig it is good enough for me" I think it is foolish not to take advantage, as at leat one person was killed alot of property damage, and this finally got attention as a Police oficer was injured. The great thing about Sig is lifetime warranty even if sold the new owner is covered.

I think this video explain perfectly why the p320 would drop Fire pre upgrade. That internal safety and battery disconnect operation now makes them functionally safe now.

An excellent breakdown of the P320, but I also want to commend the use of MAGNETS as a display stand. brilliant.

This is a great overview - a bit behind in getting a p320 (sorry live in Commiefornia) and after getting one, been impressed with the firearm. However folks are quick to judge it citing the old drop fire issues and the reports that LEOs having AD/ND. Having an engineering background myself, this review keeps me confident in the safety. Just sad that there’s a lot of bad info out there. Wonder if anyone has data on if those ADs reported by LEOs were pre-upgrade FCUs?

I purchased a new M-18 about 3 years ago. After your great breakdown, it confirmed that I do have the upgraded version. Thank you! Since that time i purchased a Canik Mete SFX. I must say that it seems to be a far better made gun. The trigger mechanism itself is worlds better and I am FAR more accurate with it. Everything functions very smooth and no slop. Not so for the M-18. I would trust the Canik over this Sig any day. I am unable to pull the M-18 trigger without a slight barrel drop. With the Canik, I get absolutely no movement. I can readily get all shots within a 2-3-inch circle at 40 feet. I'm lucky to get one shot within a 4-inch circle with the M-18. I have no idea how this gun could/should get a military contract. That said, I have ordered the skeletonized advanced trigger in hopes that it helps. I REALLY want to like my Sig M-18!

Just got a Sig. great knowledge. I just got taken to school.

Ohhhhh I see it now in this video well heck yeah thanks man

I have a p320 fcu that where the sear and safety is there’s a spring in it that isn’t in the gold aftermarket fcu what is the spring because that fcu has such a nice trigger

My upgrade made the gun almost unfunctional, the parts were so tight. Sig's "suggestion" was shoot until it works right. It would fail to go into battery 90% of the time as the slide kept braking on the disconnector. The second time it was sent back to the wrong address as the person in charge of shipping keyed the wrong zip code it and sent in off into the hood somewhere according to my tracking.

I still have the OG 320 and never once had an issue

Outstanding video,.... thanks for doing that. Just purchased a P320 and it has NOT had the upgrade yet. Do you recommend the upgrade, and if so,... are the assemblies changed, or just the parts outlined in your video combined with the original parts? That question brings up the serial number,... if the entire unit is changed they would have to re-engrave the users serial into the replacement part... How does Sig handle the serial number on the part? thanks again for a very well made video!...

Appreciate professional reviews on facts of design on this gun cause a lot of misinformation out there.

I was hoping you’d describe the original trigger reset more, specifically the “double click” and how if the the trigger was pulled enough to fire, but not past the second “click,” it would result in a dead trigger.

I've been on the fence on getting a P320, but researching and seeing a breakdown of all of its safety mechanisms helps to abate those concerns. The biggest one for me was the redesign of the sear and disconnect. Breaking down my p365, I noticed a similar design. Now whether to get a p320 with or without the manual safety! On the manual safety note, does it merely block the downward movement of the sear only? Thanks!

lol videos still showing up even though sig did this upgrade sig 320 are not safe got rid of mine got something else too carry

Awesome man! Do you think they decreased the the durability/longevity of the pistol with all the lightening cuts?

❤...EXCELENT PRESENTATION !!! BRAVO !!! I have a technical question a little bit off the topic of this clip, but related to Sig Sauer P320 gunsmithing. I'm wondering if you know the exact dimensions of the Sig Sauer P320 xten ejector ? I intend to modify a regular P320 9mm fcu into an xten fcu. I know it has to be modified in order to fit larger size magazines and i know how to do it, but i don't known the xten ejector dimensions. THANK YOU KINDLY!!!

Glad I found this video. While replacing a broken trigger bar on my post-upgrade FCU, I noted the extra spring protruding from what I now understand to be the striker safety lever. Is the post upgrade striker safety supposed to be able to function with and without the spring? Mine was "upgraded" within the first month of the voluntary upgrade program, for what it's worth.

I’ve got a question, asking for an opinion… currently have the Wilson Combat grip frame on my Sig M17. I’m conflicted about buying the AXG grip frame… anyone using it and with opinion of whether it’s a worthwhile upgrade???

What are your thoughts about the safety lock tabs “positive contact surface” deformation causing uncommanded discharges?

This gun was designed with a manual thumb safety. That thumb safety stops the movement of the trigger from moving when dropped.

Thanks for your great video! I feel much more comfortable with the safety and function of my P320XC. I knew that I had the upgraded version of the gun. But, I still went to the sig sight before and after purchase. The thing I did not know is that the trigger on the X series was not changed! I verified this by reading the FAQs. Do you know why this is?

It's interesting. I bought a sig x5 before the legion came out so I think it was 2019. I don't need to have the upgrade done because the slide already had the cut and the disconnect bar is present. But my sear and trigger bar look like pre upgrade parts.

My biggest gripe is that SigUSA shouldve made a video exactly like this when they first started this "upgrade" I have slightly more faith in the new 320 FCUs, but at the time I was not convinced it was an upgrade at all. Considering I never plan to drop my 320 at the exact angle needed to discharge unintentionally, I do not plan to upgrade mine (granted such a problem should never have been in place to begin with, SigUSA does not get a free pass regardless)

I have a pre-upgrade model that has substantial vertical movement in the slide during trigger pull. The sear won't release the striker when dry firing unless I grab the slide and lift it upward. It never shoots its last round because it needs the upward spring pressure of a round in the mag to keep the trigger functional. I ordered the newer version sear group assembly to see if it makes a difference with this issue.

So with these upgrades would you feel confident to carry one in the chamber with this platform. Do you have fear it will discharge a round accidentally such as what people were describing pre upgrade. I’m considering conceal carrying this platform and I don’t want a round to blow my Johnson off while I’m driving.

Can you make a video explaining why my m18 slide hangs up if i pull it back slow about a 1/4 inch. Only does it some times and mainly when I pull the trigger during dryfire and am trying to look at the reset. Never had any pistol do that. Shoots fine but it has me concerned. I have 600 rounds through it and it still does it. Thanks

I forgot that the P320 originally advertised the "double strike" feature.

Is there more detail you can give on the pre sig safety lever spring installation? I and would really appreciate your time and effort. Cannot find any info on this matter.

I have watched all of your videos as I purchased a P320 Compact a bit ago. When I purchased it I was unaware of the issues that had been spoken about with dropping the weapon and now more recently the weapon AD in holsters. Since I live in MA I was forced to purchase the MA compliant version of this firearm with a manual thumb safety. Does this safety in fact stop the weapon from AD during drop and during holstering and transporting the weapon (or while it is in motion)? Sorry if this is a dumb question but I was concerned once I started researching it. Your videos make me feel safe in the purchase but I wanted to ask this question.

I wonder if the upgraded mechanism would still win the US Army pistol trials? Also the US Army did not upgrade their delivered or future pistols.

Sig Sauer P320 xfive legion is the same assembly as in your video? I have xfive legion. Having problem with the trigger travel. I hope you can help me finding the right trigger assembly for my xfive. Thanks in advance.

I still have a pre-upragded p320, i added a Agency arms trigger shoe with the glock style safety, I really dont want to deal with sending crap back and from what ive read about the drop issues it was mainly from the weight of the trigger itself so Im confident the safety bar will be enough, I dont CCW my p320 its mainly for the range and I dont keep a shell in the chamber for it in the house so I think itll be good

Ive seen some p320's so bad, you could shoot them by hitting it on its beaver tail with a mallet or a light hammer. I seen it with my own eyes. Its NOT just inertia causing it to be not drop safe. I mean it is a big reason, and i do think a lighter weight trigger would logically help that, but I have seen some of these guns go off simply from a solid little bump on its backside. I mean maybe my buddie had an outlier pistol but, still. Seeing that made me really unsure about it. obviously it must not be to big of a problem, because I dont really see anyone else having this issue.