Do you have a 1911? If so you can’t beat a marvel conversion very accurate and reliable. If you do not have a 1911 are you some sort of commie? Ha ha
Best answer so far! 
I considered a Marvel as my brother has one and loves it, but opted for the 22/45 since it was half the price and a complete weapon as opposed to a conversion kit. If you can afford one, you can’t go wrong.
If the OP would like to spend more coin than that being discussed, I also have a lot of experience with high end competition style .22 pistols.
Probably the best deal out there for a reliable super accurate .22 target pistol is the Benelli MP95. Feed it good ammo, particularly standard velocity target ammo, and it will run like a top. Plus it will keep up with a Hammerli, or Pardini in the accuracy department while being more simple and reliable. Just lay in some spare firing pins (about $12.00/unit) and some spare recoil buffers.
The Smith and Wesson Model 41 is also very good, but in my more limited experience is not as reliable as the Benelli, Hammerli, and Pardini.
Myy M&P22 has been 100% reliable with Federal Bulk ammo, I would recommend it to anyone. Th Ruger 22/45 is also a good choice, all depends on what you think will work best for you.
I love my AA .22 conv kit for my G17. Runs like a champ on Remington Golden Bullets
I have had a Sig mosquito, it was a jamo matic with a crap trigger. I have a 22/45 and a MKIII target model with the rosewood grip with the thumb rest. The MKIII is crazy accurate and very reliable. IMO you cant go wrong with the Ruger. The 22/45 is nice too, I just don’t care for the polymer frame as much as the steel.
I have a Ruger Mark1 and a 22/45 and have shot most of the others, but I love my M&P.22. To my surprise it’s my favorite. It’s not fussy, and is very accurate with its favorite ammo. However it’ll run on just about anything!
I was also suprised by the M&P22, being built by Walther and so similar to the Walther P22 I was a little sceptical. But since the first trigger pull I have had 0 malfunctions. I added a Kineti-tech tread adapter and I have used my X300 Ultra on it a few times.
Yep M&P22 is my favorite along with my CZ Kadet. Both are reliable and the Kadet is built like a tank.
According to its former head instructor, the Rogers shooting school has had excellent results with its fleet of M&P22’s.
I have owned or shot fairly extensively:
-Ruger MK II Target with 4" bull bbl (very rare)
-Ruger MK II Target Government “Slab side”
-AA Conversion Glock 19 (Since 2001)
-Browning Buck Mark
-S&W M&P 22
-Walther P22
Of the above, I personally prefer the AA Conversion for training purposes, as it matches most closely with my G19. It isn’t the most reliable out there, but malfunction clearing is identical to a G19.
For accuracy shooting, I prefer the Browning Buck Mark.
For suppressed shooting, I prefer the Walther P22
For sheer fun shooting, none of the above (Ruger Single Six.:D)
I think you really need to define what you want out of it most and make your decision from that.
In my opinion, the Ruger and the Buckmark are the least suitable for “real gun” training. They are excellent for trigger control and are quite reliable and accurate but manipulations are completely different than most “real guns”.
Another one for m&p 22. It is a joy to shoot and I like the fact I shoot an m&p.
As an FYI, the other day I saw grant had them in stock…
I have the same experience with my M&P22. I bought mine because my main fullsize is an M&P9 so it seemed like a no brainer.
Love the gun and it’s run like a champ even with subsonics through my Silenerco Sparrow. Prethreaded barrel was a big plus.
I am working on getting a suppressor, I also have the full size M&P9, my LGS called last month cause the knew I wanted one, it is the Range and Carry kit, and I couldnt be happier. Out the door it was $575, not bad considering allot of places have the basic kit at that price point. I love my LGS, she has not raised prices a dime since all the crazyness, she said until her distributors raise her prices, they will remain the same.
I’ve been teaching my son to shoot recently. I got a good deal on a walther p22. We shoot weekly and around 3-400 22lr rounds and the stupid pot metal slide started chunking out. Got rid of it for more than i paid for it and bought an SR22. I would have bought a 22/45 or another heavier ruger but they were to heavy for him to use for that long of an extended session. His small hands couldn’t really use the m&p well. I now have over 2000 rounds through his ruger and the only thing i’ve ever had wrong was a failure to feed because of his technique being improper (it’s never done it on me or my girl). I paid 320 out the door for it in stainless.
I also like the M&P 22.
It’s great if you are looking for a .22LR gun that fits and functions the same way as its 9mm/40cal counterpart.
I’ve Been shooting mine with and without suppressor, it’s still running fine.
It is full-size, not scale down so if you are buying for someone with small hands you may want a different gun that is scaled-down smaller.
Kadet is still my favorite, but the M&P22 is with me now on every outing.
I must admit, I hated this little junker on sight just because of the construction and the Umarex barrel sleeve/ alloy slide… but it has earned my respect.
0 Malfunctions (now over 1K) suppressed and unsuppressed, dirty and clean.
I would even rate it’s reliability-when-filthy above my 22/45.
My only thing now is to find some good plugs and remove the huge ambi-safety.
I have owned Ruger MK II’s since 1991, and currently have three MK II’s and a MK II era 22/45. They are all accurate and reliable and some have been modded with Volquartsen accurizing kits to use when I was competing. Some are stock and still shoot very well. You can’t go wrong with the Rugers, but the Buckmarks are also very good.
If you can find a used MK II or MK II era 22/45 get it. They do not have the mag disconnect, loaded chamber indicator or internal lock that was added on the MK III.
I would agree. Get the adjustable sight model. They will last and last.
I have the AA conversion. It had some extraction issues and it was sent back to the factory to get them ironed out. It’s finicky with ammo, though CCI seems to be the best option of ammo in it. The advantage is that it works in the same gun of carry. It does lock back after the magazine is expended. The sights are good and can be replaced. Cannot be dry fired unless you have snap caps.
I have a Mark II Target Competition Slabside 6 7/8": there are no issues with regards to shooting, maintaining or cost of replacing parts. It’s a little pain to field strip but when you’ve done it a few times, it’s not hard (get a rubber mallet to make it easier). There are so many aftermarket parts to put into it. It doesn’t have the magazine safety which requires the magazine to be dry fired (has to be done when field stripping). It is one of the only 22s that allow dry fire : Rugers, I mean. It is way more accurate than the shooter. I replaced the factory trigger with a Volquartsen. the disadvantage is that it is a heavy gun. The Mark III is a pain to break down because of the process of keeping the magazine in to dry fire. The 22/45 is a nice option since the grip angle is that of a 1911 and operation is similar.
Walter P22 is can be finicky with ammo. The manual lists what ammo is recommended.It’s accurate but I don’t like how it the mag release is set up. Magazines are pricey for an inexpensive gun like this. I don’t like how the slide comes out when field stripping; It’s different.
I have a P220 45 ACP with a conversion. That is a nice combination, also. I have not had any extraction issues with it, unlike the Advantage Arms. Again, it’s a combat/duty frame with the 22LR option. Good sights and they can be replaced. Cannot be dry fired unless you have snap caps.
Some people have used 1911s and conversion slides but I have enough 22LR pistols and rifles. So I did not purchase one of them.