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Old 04-13-2019, 07:59 AM
Viper225
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MK III Not Firing 100%



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I MK III has decided to not fire now and again. I tried three different brands of ammo, and had the same issue with all brands. Some looked to be hit weak, while some others that did not fire looked hit plenty hard to have went off.

I took the bolt out and gave it a good cleaning, and Dry Lubed it. I hope that does the trick for todays Match. It did not look dirty enough to cause problems to me.

I made an order to Midway for a Tandemkross Fire Starter Firing Pin, Eagle Talon Extractor, as well as the Halo Charging Ring. I plan to start shooting Steel Challenge with it.

If it makes any difference it is a MK III Stainless Steel Hunter with a Fluted 4.25" Barrel.

Anything I need to be looking at besides the firing Pin?

Bob R

Last edited by Viper225; 04-13-2019 at 06:42 PM.
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Old 04-13-2019, 08:32 AM
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Give the chamber a really good scrubbing and check for burrs around the mouth
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Old 04-13-2019, 09:10 AM
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Quote:
Originally Posted by arjay View Post
Give the chamber a really good scrubbing and check for burrs around the mouth
^^^^This. Light strikes can be caused by the bullet not seating all the way in the chamber. Had this happen once with a 10/22. Enough of a carbon ring in the chamber will do it. Give the chamber a good soak with a solvent, scrub well with a .22 brush and re-check. If you can remove the bbl (field strip) for cleaning, you can use Goof-off or another acetone based product to soften that carbon ring in a hurry (say, a 5 minute soak). Keep aggressive cleaner away from any plastic parts though. Good luck!
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Old 04-13-2019, 11:43 AM
Woody57
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What they said
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Old 04-14-2019, 11:13 PM
Viper225
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It did not malfunction as much after the cleaning, but it does still have issues.
Switching to plated ammo did seem to help with the failing to eject issue enough to notice.

One shooter advised me that higher velocity ammo would probably help cure most of the ejection issues. He was running Winchester with a rated velocity of 1,330 fps I believe. I observed another Ruger running Winchester M22 that was functioning fairly well. I was running the Federal Blue Box 100 PK ammo.

The highly tuned 22 race guns were doing pretty well. I noticed that most of the pretty much stock MK II's and MK III's that newer shooters were using had failure to eject as well as failure to fire issues more frequently that I would have thought.

Bob R
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Old 04-15-2019, 12:38 AM
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My Mark III runs 100% reliable using CCI ammo. It likes CCI Blazer the best with CCI SV second best.
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Old 04-15-2019, 04:36 PM
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Quote:
Originally Posted by Viper225 View Post
...One shooter advised me that higher velocity ammo would probably help cure most of the ejection issues. ...

It would certainly help but it's sorta like getting a bigger sledge hammer for a construction problem. Your MKIII should run just fine on anybody's standard-velocity ammo. Well almost anybody's.


One more vote for really scrubbing the chamber. You could consider chucking a brush in a drill and spinning it it in the chamber. Carefully, of course.
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Old 04-15-2019, 07:19 PM
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I ao vote for the chamber cleaning. But I would think the new firing pin and extractor you have coming will cure your problem.
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Old 04-16-2019, 11:08 PM
Viper225
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I should be getting the parts from Midway in the next couple days.
I will spin a brush in the chamber while I have the bolt out.

Bob R
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Old 04-17-2019, 10:08 PM
Viper225
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My TandemKross parts came in today.

While looking at the You Tube video of how to replace the Extractor I believe I discovered most of my Fail To Fire problem. The Firing Pin Rebound Spring Support, and Firing Pin Rebound Spring were not in the bolt.

I have a new SS Rebound Spring Support on order from Gun Parts Corp.
The Spring is in the TandemKross Parts Kit.

I have located my Brass Cleaning Rod section used to buff the chamber with a brush. I will get on buffing the chamber shortly.

I may get it running near 100% yet.

Bob R
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Old 05-11-2019, 08:42 AM
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Sounds like some one really clesned it and lost or had parts left over. Those little parts are easy to miss. Should keep a spare or two on hand along w/ firing pin and few others.
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