Had a very disappointing day at the range today. Yeah, I was shooting reloads, but they had always been fine in my P365 and other 9mm's. I got some light primer strikes, but they always fired on the second try. Then I switched to factory new ammo and had the same problem. Out of a box of 50 I got probably 4-5 no-fires, though again, they all went bang on the second try.

About 1000 rounds ago I installed the M-Carbo lightened trigger spring kit. Everything ran fine until today. I really, really don't want to return it to stock form for a warranty claim. God, that trigger spring job sucked so badly. Will SIG touch it as is for warranty work? If I just reinstall the stock strike spring, would that be ok?

Although I have no experience with that particular spring, with other aftermarket springs for different models I found that they are more prone than factory springs to losing power to the point of failing to ignite primers after a time.

If you were to make a warranty claim,
1. What would be the basis? Why would it be SIG’s fault?
2. If they realized it was not a stock spring, I suspect they would either refuse to do anything or possibly just install a proper spring as a favor to you.

Other than reinstalling the proper spring, you might try flushing out the striker channel if you’ve been allowing oil or solvent inside. Such build-ups can lead to light strike misfires.

I would return it to stock form and re-evaluate.
At least you'll be faster this time.

Don't send it in for warranty work with a light strike complaint after you have installed aftermarket springs.

Fair enough. But again, I have lots of flawless rounds through it since the spring conversion. And don't springs lose strength over time? Seems to me, a striker spring getting weaker would not cause light primer strikes, but rather deeper strikes, no? The spring would need to be stiffer in order for the strikes to be lighter, no?

I suppose I need to pull it apart and have a look at the striker. That's a trivial matter. But that FCU is a real bitch to get back together, if I go into the frame.

quote:

Originally posted by Rick Lee:
Seems to me, a striker spring getting weaker would not cause light primer strikes, but rather deeper strikes, no?

I am quite confused at this point.

The striker spring is what serves the function of a mainspring in a hammer fired pistol: It drives the striker into the primer. If it becomes weaker with use, the impact with the primer will become weaker. I’m referring now to the striker assembly of a P320 that I’m familiar with, but I must assume that the P365’s mechanism is similar; based on photos of the striker assembly it’s virtually the same.

What do you think that spring does?
Are we referring to different things? The striker spring surrounds the striker and is in the slide, not the FCU.
Or are you just having fun with us?

I thought the spring that goes over the striker is there to retract the striker immediately after firing. Seems to me, the stiffer it is, the faster it retracts. If it's to provide resistance when firing, it would seem to me, that getting weaker would mean deeper strikes, no?

There is almost no chance that it's not the springs you installed. I'd agree with the guys saying return to stock and reevaluate.

quote:

Originally posted by Rick Lee:
I thought the spring that goes over the striker is there to retract the striker immediately after firing. Seems to me, the stiffer it is, the faster it retracts. If it's to provide resistance when firing, it would seem to me, that getting weaker would mean deeper strikes, no?

As somebody else stated, on a striker fired gun, the striker spring is what drives the striker forward. The spring also contributes in rebounding the striker, but if there is not enough force, you aren't hitting the primer hard enough. The downside is that it obviously contributes to trigger pull weight. There are other ways to compensate for this with different trigger geometry, polished parts, etc.

quote:

Originally posted by Rick Lee:
Had a very disappointing day at the range today. Yeah, I was shooting reloads, but they had always been fine in my P365 and other 9mm's. I got some light primer strikes, but they always fired on the second try. Then I switched to factory new ammo and had the same problem. Out of a box of 50 I got probably 4-5 no-fires, though again, they all went bang on the second try.

About 1000 rounds ago I installed the M-Carbo lightened trigger spring kit. Everything ran fine until today. I really, really don't want to return it to stock form for a warranty claim. God, that trigger spring job sucked so badly. Will SIG touch it as is for warranty work? If I just reinstall the stock strike spring, would that be ok?

I've had no experience with the M Carbo kit, however I have seen reports where others who have installed the kit had primer strike issues as well. Does your P365 have the original style striker or the newer style?

I got my P365 new in May, 2019. I think that's the new style striker. I'll reinstall the stock spring and try again. Until then, I'm carrying my S&W PC1911. It's cooler out now and I'm wearing a fleece when out and about.

As a general observation, you can’t install parts into a firearm that the factory did not design or manufacture and then fault the firearm manufacturer when the weapon does not work as it should.

Lightened? Meaning potentially weaker?

I'm not sure how long the service interval is before the factory striker is supposed to be replaced (5000? 10000? More?). SIG says the 365's recoil spring assembly is supposed to be replaced every 2500 rounds. While the 365's owner's manual gives no guidance with regards to the life cycle of the gun's other springs, it wouldn't surprise me if the factory striker spring is "rated" to a relatively low number of cycles as well even if it wasn't to the same 2500 cycles as the RSA is.

Then to complicate matters...putting in a non-spec, purportedly lighter/softer spring in could easily accelerate its wear, especially in a relatively small gun like the P365. After all there are quite a few subcompact pistols on the market that have relatively short life cycles for their wear parts such as springs. And as you've already stated that you've run around 1000 rounds or so on the aftermarket spring; perhaps that's all the life that the M-CARBO spring is good for? I've no experience with their products so I'm just pulling stuff out of the air.

The Mcarbo kit advertises dropping trigger pull weight to 4 lbs, from 7 lbs. It features three springs, one of which is the trigger return spring (the only spring that tends to break in the P320 or P365). I would not install a weaker (thinner, less durable) trigger return spring.

The mccarbo kit also features a reduced power striker spring. This is a ridiculous idea. That spring is what makes the pistol fire. Light strikes with a reduced power striker spring? Yes, of course.

Lightened striker block spring? Really bad idea.

The P365 has a great trigger out of the box. Put flat trigger on it, get a little more leverage nad the illusion of a lighter trigger, and be happy.

The P365 was engineered to get a lot out of a very small package. Don't try to re-engineer it.

^^^
That pretty much sums up my observations.
I'm not an engineer but a lighter striker spring will do nothing for trigger pull.
The striker is drawn back with the cycling of the slide and captured by the sear.
It's already at full compression, pulling the trigger simply drops the sear and let's it go.
It's a SA system with a long pull.
The miniscule compression from dropping the sear doesn't "cock" it.
And since it is a SA design, lightening the striker safety spring is another bad idea.

With no polishing or fiddling with mine other than dry and live fire mine is 5.5 lbs and not that bad.
It's not in the same class as my hammer fired guns and I don't expect it to be.

I agree that you can't install aftermarket parts and then expect warranty to fix anything. UNLESS the broken thing has absolutely nothing at all to do with the parts you replaced (and I doubt they'd service it even then...)

You weaken the springs and then complain about light strikes. Put the stronger springs back into the gun. Or if you just can't live with the stock trigger - sell the gun.

As other have said, put the stock springs back into the gun. And for a self-defense gun that you will use under the most dire and stressful time(s) a 6-lb trigger is next to no weight at all.

A lighter striker spring will definitely reduce the weight of the trigger pull; depending on the pistol, and the amount of movement/travel that the trigger must move the striker aft during the pull, reducing striker weight will reduce trigger pull. This comes at a cost, however.

When I've been shooting alongside someone who is experiencing light primer strikes, that's one of my first questions, and often s not, they've gone with a lighter striker spring.

The P320 may be thought of as cocked, whereas a Glock will be "half cocked." The trigger pull may be lightened more in a Glock than a P365 or P320, but there are better ways.

There's nothing stopping that P365 trigger; trigger weight and trigger control is it. Lightening it further is taking step toward a negligent discharge.

Grayguns sells a very well engineered and well thought out competition kit for lightening the trigger on the P320; they also make clear that it's not for carry. Those who use the kit understand why. Grayguns does not offer the same kit, or a kit that does the same thing, for the P365. Is it possible that anyone might not understand why?

Put it back to stock and retry.
A P365 being a self-defense pistol should not be monkeyed with in regards to lightening trigger pull weight, IMO.

Get a range gun if you want to play with light triggers.

If you have lubed the striker/striker channel in addition to the reduced power striker spring, then you have compounded your chances for light strikes.
Keep the striker and striker channel clean and dry.

One of the first step anyone should take if a gun starts to become unreliable is to clean it. Not just a wipe down, a full disassembly and soaking in powder solvent. Then brushing each part and wiping with a clean cloth until it all comes back clean. No short cuts. Even with aftermarket parts. Clean your damn gun. Thats particularly true of a gun that was running OK and then in the middle of a session starts to falter. Step #1, clean the gun.

Ran across this old thread as the only one when searching for striker spring wear. I am curious whether others have experienced 365 striker spring wear out. I am told by a gunshop I trust that they have THE biggest issues with just that in the 365’s they rent. Apparently the springs are only good for 3=4K rounds, then need replacement. Likewise the RSA needs replacement about every 3K rounds. Sort of reminds me of the old 1911’s that needed springs often.

?Any more recent experience. I bought an X-Macro and already have over 1K rounds through it. Wondering if I should buy a stock of the striker springs, as I carry the thing.