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Like others have mentioned...try CCI Mini Mags....they have never failed me yet and stay away from waxy lead 22's...especially in a semiI have fired about 700 rounds through a Mark IV Lite that I bought new last fall.
At about 600 rounds it started jamming a round in the chamber every third mag.
I cleaned it at that point, and accuracy got better but the jam still happens.
Any ideas?
I tried two distinct mags, and both had the jam. I will try the CCI mini mags. All of the rounds I fired had been Federal. Thanks, All, for the advice.Is it always one mag or certain mags that jam? I number the mags and record any fails by mag number
I concur about CCI mini mags. They fire lots cleaner than most .22s so you can go longer between cleanings . Thunderbolts are especially dirty.
View attachment 1796272
Look for built-up gunk in these areas. Waxy , dark gray crud, probably.
I agreed with both @Knobgoblin and @Alexx1401.One common theme when this happens is the extractor. They make an after market on for them that last I looked was like $10. Its a cheap thing to try that VERY often fixes this.
This is my next step if it recurs.I agreed with both @Knobgoblin and @Alexx1401.
I've owned 4 Ruger 22LR pistols over the years (Mark II standard, Mark III standard/target, Mark III 22/45 and currently own a Mark IV 22/45).
All eventually developed the problem you described, to one degree or another. All problems were resolved by taking apart the bolt, removing the extractor, firing pin and springs and cleaning thoroughly (soaking in Hoppes #9). (Of course, I cleaned the rest of the pistol too.)
I also found I could go longer between deep cleanings with an aftermarket extractor (Volquartsen).
TWYLALTR.
Good luck.
Cheers.
Thanks. Will try. Cleaned the slide & all slide parts just now, per other recommendations.Yes, clean chamber very well . Also myself any Ruger MK pistol or 10/22 pistol I buy the first thing I do is replace the OEM extractor with either a Volquartsen or Tandemkross extractor. The same extractor for both the MK pistols and 10/22 rifles.
These extractors you can usually get for less than $15 and in my opinion worth every penny. I always have a spare one of these in parts bin. There is a bit of a trick to replacing extractor but many videos on YouTube showing how. Not hard once you see it done.
I am going to stick w CCI, although will get the copper plated next time instead of the lead. As recommended above.Look on Youtube how to tune your mags I have done all of mine and makes her purr like a kitty ! I also concur with a good ole cleaning remove all carbon and use quality ammo !