https://www.thefirearmblog.com...ing-chamber-44820970

"The Remington 550-1 is one of those rare cases where complicated old-school engineering actually delivered something genuinely special.
...The Triple-Threat .22 That Actually Worked
Manufactured from 1941 to 1970, the Remington 550-1 wasn't just another .22 plinker – it was a legitimate engineering marvel that solved a problem most firearms designers don't even bother attempting: true multi-cartridge compatibility. The 550-1 could reliably cycle .22 Short, .22 Long, and .22 Long Rifle ..."



"This wasn't accomplished through simple design – it was achieved through what might be the most over-engineered semi-auto action ever created for a rimfire: the floating chamber."




"The 550-1 occupied a somewhat premium position in the market with its traditional quality construction at a time when manufacturing methods were changing. In 1971, Remington discontinued the 550-1, replacing it with the Model 552 – a similar design that maintained the multi-cartridge capability but used more modern manufacturing techniques and materials. Many collectors and enthusiasts consider the change a downgrade, as the 552 never quite captured the robust quality that made the 550-1 special.


The Last Word
You know what the 550-1 represents? Engineering without compromise. It's what happens when the solution matters more than the production cost."
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Mom(late) found one for me at an estate sale a looong time ago. It worked with shorts, longs and long rifle ammo but the safety was nonfunctional. Took it to a local gunsmith, now the safety works but it won't cycle with any ammo.

That is pretty cool. And a lot of moving parts! Do you have any idea what your gunsmith did, or if it can be undone?

I have a 552 and it reliably shoots .22 Short, Long and Long Rifle. You can even mix them in the magazine.
Quality is ok except for the stock. Really cheap, ugly wood, not walnut. Wish I could find a better stock.
Did not know the history of the 550. Thanks.

I inherited a 550 from my grandfather. It is stamped that it shoots all 22 ammo, wonder how much it’s different from yours?

92, no, not aware of what the gunsmith did.

I might try my own two thumbs inspect&repair talent this weekend.

My mom's dad gave one to my dad. My dad calls me while I was at a gun show and in the process of negotiating for one like was essentially mine when I was a kid. My dad said he'd give it to me next time he saw me, so I didn't complete the sale. I refinished the stock in 9th grade shop class, but my dad broke it after and it has a repair. It is very accurate.

This was my first gun and I got it at the ripe old age of seven. I still have it and shoot it 58 years later. It has virtually no recoil and has never been finicky about ammo. I can remember riding my bike to the Roses store to get ammo and going to the local range to shoot with my brothers. Nobody looked twice at us back then.

shoevb, I have similar memories but it was a Marlin-Glenfield tube-feed bolt action and we bought .22's at the 7-ll and rode bikes to the open palmetto and pine tree fields on the other side of the country club.

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Searched up quite a viewing list this morning:

https://www.youtube.com/watch?v=pbvkAyFF0V4



https://www.youtube.com/result...uery=remington+550-1


https://www.youtube.com/watch?...cmVtaW5ndG9uIDU1MC0x

https://www.youtube.com/watch?...cmVtaW5ndG9uIDU1MC0x

https://www.youtube.com/shorts/4DCYRm9fAdg

https://www.youtube.com/watch?...cmVtaW5ndG9uIDU1MC0x <-----common problems