ATI Omni H22 rimfire carbine

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  • Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    So, I have 2 Smith and Wesson 15-22s. One for my son in camo, and one for my daughter which is black and purple. So far the 15-22s have been flawless, and one of the most fun guns I have shot. My kids like them, they are reliable, fun, cheap to shoot.

    I decided to buy an ATI Omni H22 rimfire rifle for myself. A few things intrigued me about it. Both the upper and lower are polymer, but with aluminum inserts. The lower has an aluminum insert at the buffer tube mount and rear pin hole, and the upper has an aluminum insert at the front pin part and collar where the barrel mounts into the upper polymer receiver.

    The upper, has a functional forward assist and dust cover. The upper receiver says American tactical, but the barrel says Italy, so I am thinking Chiappa, since thats what the mag is.
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    The gun is heavier than the 15-22. I like that it looks almost identical to my Colt 6721 M4 carbine. I added a knock off Magpul Mbus rear sight, as it does NOT come with a rear sight. Eventually I may get an optic/red dot. The magazine well has a nice flair, and mags are easy to insert and remove. The gun originally comes with a 28rd magazine, but because MD, I did not take possession of the mag. It was not in the box with the rifle. I ordered the last 10rd magazine from the ATI website. I also ordered a CMMG 10rd mag. They look similar, although the ATI mag is longer. I read on the interwebs the CMMG mags work in these so I ordered one to try. The ATI mag says Chiappa on it, and is polymer. It has a thumbtab on the side for easy loading. The Chiappa mag does not drop free when the mag release is pressed, the CMMG one does. The feed lips on the ATI mag are rougher than the CMMG mag. Despite the lack of the thumbtab on the CMMG mag, it still seems better, and more robust than the ATI mag. I hope to see how they feed this weekend. I don't like the ATI or CMMG mags as much as the S&W mags, but the CMMG mags look better, IMHO.
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    The bolt is similar to the 15-22 one, so cleaning would likely be just as easy. Mine is still a little dirty, I assume from test firing?
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    The chamber and feed ramp is very similar to the 15-22.
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    The box is pretty basic. Comes with a very generic, not .22lr specific user manual, inspection card, a lock, cleaning brush, lube, and a sample of Lucas Oil gun lube.

    It has the typical cheap 6 position plastic stock. Mine doesn't seem to want to lock into position. I guess the locking pin connected to the tab is out of whack, as I have adjusted the screw every which way. I have the original S&W 15-22 stock I can sub on there for now, since my daughter has a Hogue stock on hers.
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    Hopefully we can take the Omni and 15-22 out this weekend to compete. The 15-22 is dialed in, the Omni needs to be. Once done, I will post results. The Omni has one distinct advantage over the 15-22, and partly was my curiosity into buying it. I comes with a buffer tube, buffer and spring. Can accept other uppers. But, I plan on keeping it .22lr dedicated, for now, long term. The ATI also, like the S&W has a lifetime warranty. As long as ATI remains in business. However should the lower crack, or fail, it seems the dedicated .22lr upper will hop right on an aluminum lower.
     

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    Tracker

    Active Member
    Aug 21, 2011
    587
    Anne Arundel County
    When I saw the first pic of the buffer I thought ' a buffer on a .22? ' Why? but maybe they just took the complete lower from their AR-15 to streamline production. Your daughters 15-22 is very nice looking. I'm very anxious to hear how they compare at the range.
     

    joppaj

    Sheepdog
    Staff member
    Moderator
    Apr 11, 2008
    46,447
    MD
    Very nice write up, thank for sharing that. I'm always curious with .22s to see how ammo picky they are.
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    So, is it better than the 15-22. Yes.






    Ok, I lied. It isn't. The 15-22 has maintained a pretty consistent record for me of being reasonably accurate, easy to clean, reliable.

    I took the ATI Omni H22 to the range today. I did clean and lube the gun prior.

    The mags were one ATI 10rd mag, with Chiappa printed on the side. I did smooth the rough edges on the feed lips before shooting. The other mag was a 10rd CMMG mag. The CMMG mag is nicer, and seems more durable. But the ATI mag has a thumb tab on one side, making loading much easier than the CMMG mags where you have to push them down, and back. Overall, I like the ATI mag in function better. It is a hair longer than the CMMG mag, but the CMMG mag looks like a real 30rd AR mag in the gun, not a rimfire mag. Blackdog mags may work, I dunno. I had no feed issues with either mag. I never had any extraction or ejection issues. Just the click of disappointment.

    Started off with crappy Remington Golden bullets to try to break it in. Got a large number of failure to fires. In the CMMG and ATI magazine, both seemed to feed fine, without issue. I attributed it to the crappy ammo, because even my Marlin 795 had problems with it. I finally gave up on the Remington and tried the Federal Automatch. About a 20% failure rate. I had 2, 10rd mags. I had about 2 failures to fire each mag. Never completely made it thru a mag. I would pull the trigger, hear the click, wait a few seconds, then pull the charging handle and expell the live .22lr round. Then after frustration I tried a 333 box of the Winchester ammo. Same nonsense. It appears the hammer is hitting the firing pin, but with not enough force to light all of them off. Very light dents on the rim. I am going to contact ATI and see what they say. It has a lifetime warranty, but didnt think I would need it this soon.

    The rifle came with a front sight, and picatinny rail. I added a spare Mbus knock off rear sight. The gun was shooting low, which I figured was the cheap rear sight's cause, but it did group pretty well at 15 yards for the function test. It was all I had though at the time. I will try to adjust it later, but was too frustrated with the clicks to fool with the rear sight.

    I was never under the impression the ATI would be able to compete with the 15-22, or even Ruger 10-22, or my Marlin even. But, I bought it for the flexibility the 15-22 can't offer. So, my initial thoughts are, if anyone is looking for a DEDICATED .22lr rifle, the S&W 15-22 is by far my favorite. I will never replace them. However if you want a .22lr with the potential flexibility to shoot other calibers, stay tuned and see what ATI does with mine to remedy the issue. I kinda wish I had waited for the Rock River Arms all aluminum one, but I was impatient.

    I will post updates when I have something to update.
     

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    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    Update;

    So, I called ATI, and they are having me send it back to look at. I really hope they fix it. It isn't as good as the 15-22 as a dedicated plinker, but the 15-22s are going to my kids, and I would like this one to work reliably. Will post results when it returns.
     

    Gcs7th

    Ultimate Member
    Jan 26, 2012
    1,280
    AGC
    Ps you can run S&W mags in your lower too, I use them in my AR22 and they work great. There an adapter that also adds LRBHO.
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    Ps you can run S&W mags in your lower too, I use them in my AR22 and they work great. There an adapter that also adds LRBHO.
    I was kinda frustrated with the misfires, I didn't even notice if this had LRBHO. The price of the mags are about the same, so it isn't an issue, and my kids will take all the 15-22 mags, but I may give them a try. The CMMG mags are really nice, just wish they had the thumbtab the ATI mag has. That is the one thing I love about the 15-22.
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    So, I ended up returning the gun to ATI for light strikes. Took about a month and a half, but not complaining as long as it works. I didn't hear from them for a while, so I emailed them and they did respond quickly saying it was on the rack to be looked at tomorrow. Then they told me it was an older model, and may not have parts for it, so I should look at the catalog and see if any other guns in the comparable price range looked interesting. THAT did frustrate me a bit. It was a brand new gun, but built in late 2017. I assume it had been sitting in a store or warehouse for a while. I told them I preferred to have the rifle fixed, and they told me they would do what they could. A few days later I got an email saying they were waiting on a part. Few days after that, a shipping notice. I just got it back a few days ago. Box had the rifle, my mag, a work mat, some hats, and a sticker in it. The work notes said the gunsmith initially did a visual inspection and didn't see anything wrong, but then they did have trouble test firing. Replaced the firing pin. I know you aren't supposed to generally dry fire rimfire guns, but I don't know how many times, or what people did to it prior to me buying.

    I have not test fired it yet, but hope to soon, and will post the results. I am really hoping it is fixed and 100%. I still think the S&W 15-22 is a better dedicated .22lr rifle, but lacks one thing the ATI has. Compatibility. So, I will again re-test the 3 types of ammo I previously tried, and see what happens.
     

    TomisinMd

    Ultimate Member
    Mar 11, 2013
    1,728
    Elkton, Md
    If your still looking, I'd recommend the Sig 522 (discontinued but you can still find them), or the Kris Defiance. Fantastic 22 rifles!
     

    photoracer

    Competition Shooter
    Oct 22, 2010
    3,318
    West Virginia
    The gun is heavier than the 15-22. I like that it looks almost identical to my Colt 6721 M4 carbine. I added a knock off Magpul Mbus rear sight, as it does NOT come with a rear sight. Eventually I may get an optic/red dot. The magazine well has a nice flair, and mags are easy to insert and remove. The gun originally comes with a 28rd magazine, but because MD, I did not take possession of the mag. It was not in the box with the rifle. I ordered the last 10rd magazine from the ATI website. I also ordered a CMMG 10rd mag. They look similar, although the ATI mag is longer. I read on the interwebs the CMMG mags work in these so I ordered one to try. The ATI mag says Chiappa on it, and is polymer. It has a thumbtab on the side for easy loading. The Chiappa mag does not drop free when the mag release is pressed, the CMMG one does. The feed lips on the ATI mag are rougher than the CMMG mag. Despite the lack of the thumbtab on the CMMG mag, it still seems better, and more robust than the ATI mag. I hope to see how they feed this weekend. I don't like the ATI or CMMG mags as much as the S&W mags, but the CMMG mags look better, IMHO.

    Looks to me like the Black Dog Machine semi transparent mags with the steel feed-lips would work also.
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    Update

    So, I FINALLY made it back to the range with it today. It sh!t the bed. I got about 5 rounds about before getting click after click. I may try a new hammer spring. I am frustrated because it was pretty accurate, and has great potential. I REALLY wanted it to be a success. Not because I dislike my 15-22s, because I love them, but because the ATI is more AR like and can accept centerfire uppers. I may, or may not contact ATI again. They said they replaced the firing pin. They also told me they didn't carry parts for this model, so be ready to accept a replacement, of a different equal value gun. It sucks, but it is what it is. I rolled the dice and lost. I am going to see if I can try a few things and make it work. But highly frustrated with it. At least I took 2 other guns with me to shoot.......
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    UPDATE

    So, I kinda put this rifle on the back burner and gave up on it for a while. Since most every other ammo is crazy expensive and hard to find now, I dug it out and called ATI. I talked to them on the phone, and since it got dramatically worse after I sent it back to them, and all they did was replace the firing pin, they figured that may be the pin, since that was the only thing changed. Got the pin earlier this week. Took the bolt assembly apart and cleaned it, replaced the firing pin, and cleaned the channel. Then decided to look into the trigger. The ATI has a polymer lower, no big deal for .22LR, but has anti-walk pins. I guess the screws were stripped, as I had to use an exacto knife to help pry out the screw to get to the pin. Got it put in and decided to replace the hammer spring as well, and the original one was in backwards according to the interwebs. Got it all back together and did some dry firing using a piece of wood as a block to prevent the hammer from hitting the receiver, and it seems to fire just fine. I HOPE to take it out next weekend for testing. I am hoping it takes care of the light strike issue. :party29:
     

    Sirex

    Powered by natural gas
    Oct 30, 2010
    10,380
    Westminster, MD
    Took it back to the range yesterday after swapping the firing pin, and installing a heavier hammer spring. The original hammer spring was installed backwards. I had a few rounds of CCI left so I loaded them up, and the gun ran thru them ok, no light strikes. Then I switched to one of this Winchester white box 333rd boxes of copper plated .22 and it shit the bed. Problems feeding, extracting. I did some Google searching and found the Winchester stuff is not universally great stuff. I looked in the box and some of the rounds were crooked and bullets loose. I am going to speculate it is ammo related, as it ran fine with the few CCI rounds I had left. I will try to take back different ammo next time. But, the light strike issue is gone, replaced by feed problems. Ya live, ya learn.
     

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