HKPRO Forums banner

Improved my VP9 trigger pull dramatically

152K views 148 replies 78 participants last post by  Gigafloridaman  
#1 ·
Okay, this isn't another OCD9 thread. I've had y VP9 since December. I love it. It shoots very well.

With that said, I've remarked in the past, that there was a pretty drastic 'hump' feeling during the take-up. It was pretty noticeable when the trigger bar and disconnector bar were lubed. If I used a spray cleaner on the trigger bar area when cleaning the gun and didn't oil that area, the trigger would severely bind up. That little 'hump' in the take up would require a pull of about 15lbs before breaking and pull straight through the actual sear release.

If I lubed it up, it would go back to just being an annoying 'hump'. I assumed this was normal, but everyone talked about how great the trigger pull was on the VP9 and while the actual break was okay, the take up was cludgey and chunky. I ignored it for a while and just lived with it, loving the gun all the same.

After I got the Ultra match spring kit which would cause the trigger to fail to reset about 40% of the time if it was released slowly, I took a look at these parts, trying to figure out what was causing that hump in the trigger pull. After some analysis, I realized it was right when the little tab on the trigger bar would hit the ramp on the disconnector, drawing it down to make contact with the sear actuation lever. I didn't really see too much wrong with the ramp, it was just a straight cut angle. So I took my small honing and polishing stones and worked the corner over for a while to give it a little more of a rounded curvature shape. I finished by polishing up the bit with some rouge. No power tools were used. This is just hand done. Not much material was being removed.

After I reassembled, I instantly noticed a dramatic improvement in the trigger pull. "This must be what everyone else was raving about!" I thought. I've lubed it and degreased it with a spray cleaner like I had before and it remains smooth with no binding. I'm thinking maybe the disconnector on mine was out of spec or something. Perhaps I'll try to order a replacement at some point, but for the time being, it seems to be working very well. It really improves the trigger pull of the gun. I still have a problem with unreliable reset using the ultra match trigger return spring, but the sear spring is in and working just fine. I like the combination.

If anyone is interested, this is the area that I rounded and polished. If any of you have a stagey feel to the trigger, give it a shot and see how it works.

Image
 
#5 ·
Best of luck. It's easy to remove. If you follow the video for installing the ultra match spring kit, that will walk you through it. Only caveat is if you don't have the trigger return spring tool from HKPARTS, you might not want to do it. It's pretty much a required tool for working on HK's. Highly recommended. It's possible to do it without the tool using the thin needle nose pliers, but the cupped shape of the tool makes it a billion times easier.



em.en said:
Does your trigger bar engage the sear release the same way? Perhaps this could solve my own issue.
Yep. Didn't change engagement points at all. Just smoothed out the take up.
 
#3 ·
I still haven't had any problem with the reset or hump in the pull. Glad you fixed it
 
#12 · (Edited by Moderator)
Assuming that you put the gun back together properly, I am suspicious of your gratuitous grease+delube routine. What happened to using a drop of penetrating oil? A lot of those parts should be able to function perfectly well dry. Also, how often are you detail stripping and lubing this gun? There seems to be a lot of greasing and delubing going on. In any case, 15 pounds of trigger pull indicates the gun is absolutely NOT functioning correctly. That gun should have gone back to HK or at least to a competent gunsmith before removing any metal from the disconnector, if normal operation was your aim.
I stripped it for the first time when I installed the ultra match spring kit. The other degreasing was just using spray gun cleaner. And yes, i was just using oil on the trigger bar/disconnector. As I mentioned, the very heavy trigger pull only showed itself when the gun was bone dry. I also thought it was not normal, however, with a little oil on it, it really tamed down and it was just a bit of a 'hump'.... as I mentioned. This is why I didn't send it back. Being the only VP9 I've shot, and it shot perfectly fine, I just assumed this was normal operations for the design, even if a bit strange in my opinion. It didn't seem worth footing the bill to ship the gun back to HK to analysis and them possibly telling me nothing was wrong.

There is a light point of resistance about halfway through the VP9's take-up, but I am 99% sure the disconnector isn't involved, since the resistance is linked to the point when the trigger bar meets the firing pin block lever, which would naturally create a bit of resistance as the lever is moved to the side. I could be wrong, but I looked at this too, hoping to understand why the take-up had that point of resistance, and all signs pointed to the firing pin block lever. However, for me, it turns out that the best solution, as with any striker-fired gun, was to just shoot it and dry fire it a lot. It smooths out quite a bit in normal use. However, even when it was new and still gritty, that point of resistance in the take-up was never very much, probably well under a pound of resistance.
Good thing for that 1%. Yes, there is a small bit of resistance on the firing pin block, but that's not what this was. As shown in the pic above, there is a ramp in the disconnector. There is a tab on the side of the trigger bar which rides this ramp and pulls the trigger bar down to mate with the sear activation lever. On my disconnector, this angle was cut very sharp. It was not rounded - even as much as this photo seems to indicate. All I did was smooth out that transition and it fixed the issue. There was obviously a small burr that was catching.

(Quoted material deleted by moderator.) Nobody I have heard talk about the trigger of this gun has mentioned that they had to do kitchen gunsmithing in order to get an acceptable pull. Besides, nobody talks about the trigger take-up when praising a trigger. The break and reset are always the main focus. Did your gun have 15 pounds of resistance in the take-up when you first took it home from the store, even before applying grease and delube to everything and swapping out the springs? If so, it should have gone back to HK. If not, then something went wrong when you were doing things to it. Either way, that is absolutely not normal.
(Material deleted by moderator.) It took more than 6 months and 2,000 rounds through the gun before I actually did anything about it. And even now, the only reason I attempted to do what I did was because I picked up the ultra match spring kit and had to take it apart to install those. Otherwise I would have left it alone. I'm happy that I made the change and I thought maybe it would help some other people - which apparently, I'm not the only one who had the issue as evidenced above.
 
This post has been deleted
#16 ·
Thanks for the pictures Uncle Malice. I have the hump (not pronounced but annoying) and I ordered a new disconnector. I will try the new one first. If no improvement, then I will polish as you describe. H&K did ask if I wanted to send the gun in, and I still may if the treatment doesn't work. The strange thing is that I've tried three different VP9s two had the hump one didn't. I'm guessing the two with the hump, mine included, were out of spec. If a new disconnector brings it into spec I'll be ecstatic. The friend who also has a hump thinks it's normal. I know it is not only because I've tried one without it.
 
#17 ·
Thanks for the info. As I mentioned, mine is the only I have experience with, so I didn't think much of it. I'm sure most people don't thoroughly degrease their guns during cleaning so the really sticky/binding issue would probably never rear its head with most people. I'll have to start trying some others in the case if they have them at my local shop. How much was the disconnector from HK if I may ask?
 
#19 · (Edited)
I'm going to stay out of the argument but I will say these things...
1. The OP did state about 15 lbs and did address dry.
2. I run my HKs mostly dry and at times, dry and or dirty, indeed. I do not abuse them, I treat them well and light lube as needed and as appropriate, protective cover for the extra benefits and stored is entirely different. I avoid wear and I protect finish while following the manual. I also ask experts I respect for their inputs.
3. I never ever had anything close to what the OP is reporting herewith my VP, but I have also not shot it as much as i wish due to a pib winter of ills.
4. I do appreciate the OP for their detailed account and if it helps others great.
5. Myself, if I had noticed a 3 times more than normal pull in my new VP I would have asked CS about it before grinding or polishing as this is the first I have heard of this issue since all the torture tests, reviews and mass rounds downrange reports have been in and thus, sounds abnormal and HK I think would have gladly taken it in for a good check up.
6. I am not implying that the OP did not indeed encounter an oddity.
7. Good report. I learned from it. I'm glad I have not encountered it myself. I am glad that my son hasn't with his VP. I am glad that in one year's time this is the first report of anything like this I have heard of. Bravo HK for another fantastic HK design! Most all the reviews and owners love them and a bunch have been sold... Hope the VP40 and P30sk sell wild too... more the better for HK.
8. This report may aid those who wish to experiment to see if they see some performance upgrade on regular, non issue, perfect HKs. However, myself, I do not want a light trigger and having a perfect VP myself, I do not need to attempt this. Other people who like to play and tweak, this post might be of help to them. If others find this tweak worthy... then perhaps the OP has tripped over something... There are people doing VP trigger jobs so apparently they played with, filed away at, polished and buffed until they found the way to charge hoards of $$ for a minor tweak of an already very good HK trigger that really needs no help out of the box. The mass reviews verify the great trigger... So with all that said... I will be interested to see if this thread brings help to others... Perhaps a new GG, BS type a guy has arisen with a much less costly tweak. Don't dog it until it is proven unworthy, if it ever is... Though do realize you remove your warranty protection if you tweak... but then again... it is a low priced HK to mess with... not much more than the MSRP of many a 22s these days... so play away and do what fits your needs and makes you happy. After all it is your money you are firing away... so have a bang for that buck!
 
#24 ·
I intalled the new disconnector ordered from HK. It didn't help, so I too rounded off my original disconnector. It seemed to help with the hump but the trigger reset felt odd. As it turned out I had incorrectly re-installed my trigger rebound spring. I ordered a new rebound spring ( destroyed the original trying to get it back in correctly) and a new disconnector from HK Parts. Put in the new spring and the new stock disconnector; the hump was gone. Now the trigger moves straight to the break point, no hump in between. I'm much happier. Thanks Uncle Malice for drawing my attention to the disconnector.
 
#25 ·
Glad to hear you got yours fixed as well. If you don't have one yet, I highly recommend the HKPARTS trigger return spring pliers. They make that job absolutely painless where it can often be a real pain without such a tool. I got by with just some thin needle nose pliers for a while and made it work, but now I'm super glad that I spent the money on the right tool for the job.

I'll try picking up a new disconnector at some point and see how it works. I'm still happy with the polish job I did on mine for the time being.
 
#26 ·
I want to see how good the SFP9-SF trigger is compared to hkparts and stock vp9. 6mm trigger 3 mm reset.
 
#27 ·
Per info I got from HK SFP9-SF trigger is VP9 trigger. HK takes travel measurements according to TR, that means in middle of trigger shoe.
 
#28 ·
You had to go and bust my bubble. Why doesnt HK USA descibe it the same?
 
#29 ·
I am just surprised that I am hearing all these complaints about the VP trigger. Mine has been excellent. Way to think out of the box though Malice! DIY jobs are always the most rewarding.
 
#30 ·
Congrats on fixing it, definitely took some initiative. Honestly though if I was getting 15 lb. pulls (I'm going to assume that's an estimate as I don't even know of a gauge that measures 15 lb. unless you were hanging weight off the trigger with the muzzle in the air) I would have called HK cs. That's unacceptable and the manufacturer should be made to fix it.
 
#31 · (Edited)
I've always been curious why I wasn't impressed with my trigger as much as most people claim to be about their VP9s. It seems my trigger has the "bump" this thread is referring to, furthermore it's creepy near the break. For those of you who own VP9s, let me know if your factory trigger performs similarly to mine. For the record, before I recorded the video I cleaned and lubricated the gun (Thanks Navy Man). It's had 200 rounds through it in total. Thanks guys.
RR
 
#33 ·
I've always been curious why I wasn't impressed with my trigger as much as most people claim to be about their VP9s. It seems my trigger has the "bump" this thread is referring to, furthermore it's creepy near the break. For those of you who own VP9s, let me know if your factory trigger performs similarly to mine...

It's a combat/defensive pistol and not a Camp Perry Bullseye 1911 with a 2 lbs. glass rod trigger. So, quit trying to "stack" the trigger as it's not designed for that. You're trying to play a guitar like a piano. Line up the sights & press all the way rapidly. :wink:
 
#32 ·
I think mine does this ^^ but not so pronounced. And certainly not even noticeable if pulling all the way through. I tend to agree with others who have said there was something wrong with the OP's gun... I've never felt anything anywhere near a 15 lb pull... Nothing over maybe 6 lb and that's at the break not before.
 
#34 ·
I agree with BPman about how to pull the trigger on a combat pistol.

However, I have also learned more about gun parts since my son has become a machinist. Working on a CZ 75, I found that a little polishing on certain parts is a valid way to improve a trigger. With production methods these days, drop in parts can often be improved and get a little closer to the older hand fitted guns. Especially since he didn't use a dremel, but only hand polished, I am sure he didn't cause any issues with reliability. You DO NEED TO BE CAREFUL how you do work on a self defense pistol.

Good job Uncle Malice