Misfire? Ruger P89

[Sparks57]

I've had my Ruger P89 since the early 90's. It's been a great gun, I bought right before the magazine limitation so I was able to get a 15 round magazine.

I've never had a misfire in all of the years firing it. So last week I replaced the hammer spring with a Wolf Spring. The trigger pull has dramatically improved.

So, I'm at the range, and firing Winchester FMJ 115 grain. For whatever reason, I've never fired Winchester 9mm ammo on this gun. I had picked up the 100 round value box. Out of 80 rounds fired, I had two rounds that didn't fire.
So I had the TulAmmo steel 9mm, and fired 50 rounds with 1 misfire (first time with this ammo as well).

My question is, do you think it's the ammo or hammer spring? Normally, I'd blame myself for operator error, but I don't think so. BTW I had a smith put the spring in.

Sorry for the long post...

[SILENT GUNMAN]

If the trigger pull improved it sounds like the spring you had put in is lighter than the original. I would put the old one back in and see if the problem goes away.

[Bravodigger]

It's gotta be the spring. My P series is still all original and has fired hundreds of Winchester rounds with zero issues. Never fired TULA though.

[Speedpower]

I have the same problem with my P89, the problem only went away after I replace it with a new firing pin, for some reason the new firing pin is a tad longer or the old firing pin is a tad shorter! it never misfired ever again after replacing the FP. the parts are cheap from MidwayUSA

[Sparks57]

Great input. I'll look into the firing pin. I'm really happy with the trigger pull, my target shooting has improved as well. If the Firing Pin doesn't work, then I'll put the spring back in.
Thanks for the input. This was one of my first guns, and still my favorite hand gun to shoot.

[Speedpower]

I'm currently using a 19 lb main (hammer) spring and I'm loving the trigger pull!

[BigPimping]

My P95 with Wolff springs is flawless.

[stormvet]

Just a side note. I have been reloading handgun rounds for over 20 years and have noticed in the last couple of years that primers seem slightly harder the in the past.
A lighter hammer spring combined with harder primers could lead to light primer strikes. I don't know how many rounds you've fired over the years, but as stated above a new firing pin may be the answer.

[fal_762x51]

The last lot of Winchester .40 S&W I shot had two dead primers. I mean I tried to fire it out of three different guns and they would not ignite.