Changing Hammer Spring on Ruger Mk.3 22/45?

mmattockx

mmattockx

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I've been getting a lot of dud rounds lately on my 22/45 and I'm beginning to suspect the hammer spring is going soft on me. Is this something that is reasonable to change on my own? Looking at the housing the spring is in, it appears all the pins are peened over or otherwise not easily removable.

Has anyone put a new spring in their Mk.3? Any info, experiences, guidance appreciated.


Thanks,
Mark
 
I had an older Ruger pistol with the original hammer spring working just fine for 40 years.

Possibly it needs a good cleaning so it slams shut fully?

Lots of You Tube videos out there.
 
guntech said:
Possibly it needs a good cleaning so it slams shut fully?
Click to expand...
I thought it was getting gunked up, so I stripped it down and cleaned/lubed everything with no improvement.

warzaw said:
that plus possible ammo some batches have duds all brands.
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They sure do. The problem here is it used to mostly have problems with Federal blue box, but now it has decided everything is a problem...


I had a PM suggesting the firing pin rebound spring may be at fault, but that also seems to be fine and was not dirty or damaged. It's quite frustrating having a gun that used to be super reliable go south like this.

Keep the suggestions coming, gentlemen.


Mark
 
Put the mainspring housing in a vise. Then spray it with alcohol and work the strut up and down trying to free out any gunk, or push down slightly and use compressed air and blow it out.

Cannot say I had any issues with my MK2 and MK3.

Maybe the magazine disconect isnt allowing the hammer to fully drop.
 
A faulty mainspring would be way down on my list of possible sources for this malfunction.

Clean the chamber well.
Make sure there is no peening at the chamber mouth where the FP could strike.
-If there is peening that will need swaged and additional attention paid to the FP and it's parts.
Clean the extractor notch in the barrel, scrape the crud out.
Scrape the crud from the bolt face.
Make sure the extractor moves freely, deburr extractor and extractor plunger.
Make sure the rebound spring fully retracts the FP.
Make sure any scope mount or plug screws are not protruding to the interior where the bolt travels.
If recoil spring seems weak then replace that assembly.
 
OkayShooter said:
Maybe the magazine disconnect isn't allowing the hammer to fully drop.
Click to expand...
Removing the magazine disconnect from MK 3 guns is always a good idea anyway as it improves reliability. Use the Tandem Kross spacer:
https://tandemkross.com/steel_hammer_bushing

Mark, if you would like a TK spacer, contact me if you wish as I have a couple of spare ones.

Another thing in MK 3 guns that can be an issue is the loaded chamber indicator. Many folks, myself included remove this worthless part for improved reliability. The gun runs 100% without it and there is no longer a possibility it can cause interference at the chamber.
 
Cocked&Locked said:
Removing the magazine disconnect from MK 3 guns is always a good idea anyway as it improves reliability. Use the Tandem Kross spacer:
https://tandemkross.com/steel_hammer_bushing

Mark, if you would like a TK spacer, contact me if you wish as I have a couple of spare ones.

Another thing in MK 3 guns that can be an issue is the loaded chamber indicator. Many folks, myself included remove this worthless part for improved reliability. The gun runs 100% without it and there is no longer a possibility it can cause interference at the chamber.
Click to expand...
Probably why I never had an issue with my MK3. All that stuff was removed, and my MK2 2245 never had those safety bits from factory.
 
OkayShooter said:
Put the mainspring housing in a vise. Then spray it with alcohol and work the strut up and down trying to free out any gunk, or push down slightly and use compressed air and blow it out.
Click to expand...
I was looking at that and thinking it could use a blowing out. Will get to that tomorrow.

Cocked&Locked said:
Mark, if you would like a TK spacer, contact me if you wish as I have a couple of spare ones.
Click to expand...
I appreciate the offer, but I removed the mag disconnect years ago.

Cocked&Locked said:
Another thing in MK 3 guns that can be an issue is the loaded chamber indicator.
Click to expand...
I will have a look at that as well.


Mark
 
mmattockx said:
I was looking at that and thinking it could use a blowing out. Will get to that tomorrow.


I appreciate the offer, but I removed the mag disconnect years ago.


I will have a look at that as well.


Mark
Click to expand...
You check the firing pin?

I love having a small compressor on my cleaning bench for the soul purpose of blowing out crud in guns.
 
OkayShooter said:
You check the firing pin?
Click to expand...
Yeah, it looks fine. The gun has maybe 3000 rounds through it in my hands and was lightly used before that, so nothing should be worn out. I am going to strip the bolt down again and have a close look at the chamber face for any damage. It sure is a super annoying problem.


Mark
 
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