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Normal Topic 25 rim conversion (Read 453 times)
Jonathan
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25 rim conversion
Oct 17th, 2026 at 8:41pm
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Wondering if a Favorite in 25 rimfire can be converted to 22 LR with out altering the breechblock or does the firing pin channel have to be welded and redrilled.
  
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bobw
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Re: 25 rim conversion
Reply #1 - Oct 17th, 2026 at 11:57pm
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I would never guarantee anything on these old guns.  

But, I would think it will work.  Even if it doesn’t, I would not weld up the fp hole.  I would elongate the small fp hole toward the bore center.  Then make a new firing pin that will fill the hole and hit the 22 rim.  This does take some lathe and mill work work.

I just finished doing this to a Remington #4 in 32 rimfire and it has worked fine so far.
Bob
  
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Sure shot
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Re: 25 rim conversion
Reply #2 - Oct 18th, 2026 at 5:15am
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Since upwards to a million favorites were made it's not that difficult to find a replacement 22 breech block.
  
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Deadeye Bly
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Re: 25 rim conversion
Reply #3 - Oct 18th, 2026 at 11:05am
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It should work without any alteration. As mentioned, a 22 breechblock should not be too hard to find if you find you need one
  
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rnnhntr
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Re: 25 rim conversion
Reply #4 - Oct 22nd, 2026 at 11:50am
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Yes it works, or at least it did on mine. After lining the barrel to .22 LR all I had to do on mine was install a new extractor. I have since put a couple thousand rounds through it with a variety of ammunition and no misfires.
  
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Dellet
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Re: 25 rim conversion
Reply #5 - Oct 22nd, 2026 at 11:57am
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Depends mostly on the current block. I’ve seen 32 in 25, 25 in both 22 and 32. 

It would seem that you can be one caliber off and still work.
  
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