Umarex Notos Bolt Probe Alignment

Hey all. So I have a new to me Notos bottle build. Only had it for about 2 months. It was purchased from a forum member who got it off another forum member if I remember correctly.

I'm having a big issue with the bolt probe or pellet probe, not sure which term is correct. It's not to the typical Notos magazine issue, I have a lot of different Notos mags from aftermarket companies and all have the same issue. It even messed up one of my Maple mags in the process, which was also partly my fault for forcing the cocking level because the pellet was so mangled I couldn't push it back through the barrel to remove the magazine. The probe is extremely loose and moves around until it engages the tapered thicker end, then it sits solid. It doesn't the same thing with a single shot tray when loading. Catches the pellet it a weird angle and lowers the head of the pellets and raises the skirt while going into the chamber. You still have to force the pellet and deform it using the single shot tray, also have more than one single shot tray and happens with both. If I load a single pellet without a tray, which takes forever with my fat fingers and scope setup, the gun shoots great.

My question is does anyone know of a fix for this? Can the probe be tightened back into alignment or does it need to be replaced? Is it a thing to replace? I've looked and haven't found anything for a replacement probe online. Did a search here and didn't see anything on the issue, although I may be searching the wrong terminology.

Hoping to get this figured out so I can have the motivation to track down the slow leak it's had since arriving. Don't really have much motivation to fix it when it takes 10 minutes, definitely exaggerating, to load a single pellet. I've attached some videos to better describe the issue. Any help of insight would be greatly appreciated.
 
Hey all. So I have a new to me Notos bottle build. Only had it for about 2 months. It was purchased from a forum member who got it off another forum member if I remember correctly.

I'm having a big issue with the bolt probe or pellet probe, not sure which term is correct. It's not to the typical Notos magazine issue, I have a lot of different Notos mags from aftermarket companies and all have the same issue. It even messed up one of my Maple mags in the process, which was also partly my fault for forcing the cocking level because the pellet was so mangled I couldn't push it back through the barrel to remove the magazine. The probe is extremely loose and moves around until it engages the tapered thicker end, then it sits solid. It doesn't the same thing with a single shot tray when loading. Catches the pellet it a weird angle and lowers the head of the pellets and raises the skirt while going into the chamber. You still have to force the pellet and deform it using the single shot tray, also have more than one single shot tray and happens with both. If I load a single pellet without a tray, which takes forever with my fat fingers and scope setup, the gun shoots great.

My question is does anyone know of a fix for this? Can the probe be tightened back into alignment or does it need to be replaced? Is it a thing to replace? I've looked and haven't found anything for a replacement probe online. Did a search here and didn't see anything on the issue, although I may be searching the wrong terminology.

Hoping to get this figured out so I can have the motivation to track down the slow leak it's had since arriving. Don't really have much motivation to fix it when it takes 10 minutes, definitely exaggerating, to load a single pellet. I've attached some videos to better describe the issue. Any help of insight would be greatly appreciated.
View attachment 557055
The easiest fix is to buy new magazines, this is a known issue for the notos since it came out.
 
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Big Air Precision makes some nice NOTOS magazines but I read that you said it wasn't a magazine issue.
This video make help you understand the NOTOS bolt and cocking lever assembly. The only difference is that the NOTOS lever is on the opposite side.
The issue with the probe being loose causes hang ups as the pellet exits the factory magazine, because it goes in cockeyed into the breech. Getting a Big Air Precision mag fixes the issue as it forces the probe to only go straight.
 
The easiest fix is to buy new magazines, this is a known issue for the notos since it came out.
Not a magazine issue. I have another Notos so I have multiple mags and does it with all of them. Even does it with both the single shot tray I have. Tried with Maple mags, Big Air, and Orion. That was my first thought as my other Notos had mag issues. The probe is noticeably more "wobbly" when moving compared to my other one
 
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Not a magazine issue. I have another Notos so I have multiple mags and does it with all of them. Even does it with both the single shot tray I have. Tried with Maple mags, Big Air, and Orion. That was my first thought as my other Notos had mag issues. The probe is noticeably more "wobbly" when moving compared to my other one
Gotcha, mine did it while being wobbly and the issue was solved by getting an aftermarket mag, yours is clearly has a larger issue at play.
 
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Gotcha, mine did it while being wobbly and the issue was solved by getting an aftermarket mag, yours is clearly has a larger issue at play.

20250421_202525.jpg

I figured as much. I did try, but no luck. Much appreciated
 
Be careful that all those little parts go in exactly like the video shows. Some pins from the bottom and others from the top.

I agree with this. I have marked the video posted by @Avator where you need to pay attention closely. At the first time index (2:30 to 2:35) note the little shim washer that falls out as he is removing the cocking lever. Note the second time index (5:18 to 5:27) when he is re-assembling to put the replacement lever back in. This assists in insuring the back portion of the cocking lever mount is in proper alignment. Make note of which side it needs to go on. When I replaced my cocking lever, this shim was present. So I made sure I put it back exactly how it came out.

Being out of alignment will cause issues like this. Also, loose fit will as well. You probably need to insure this shim isn't missing, or may need to shim it in other areas of the cocking lever mechanism. Either way, used properly, shims will insure alignment and tighter fit.

What do I know though, I'm not a gunsmith. So, I could be completely wrong <grin>.

Time index 1 link

Time index 2 link
 
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Upon looking at it closer, not only does the probe move, but it is bent upward towards the tip. Makes sense since you can clearly see with the single shot tray it presses the top of the skirt on the pellets and the maple mag it messed up was also in that upper portion.

Looking for a new probe now and straighten this one out and see if it helps for now.

Not sure if this pic angle shows it as well, but it shows itself a lot more in person.
20250421_215349.jpg
 
That was mine a long time ago. That shouldn't be possible it has the multiple holed TP for the FX barrel. IS there an oring in that breech? Also, you can turn the TP around... it doesn't matter which hole faces down, There is a channel and it gets equal flow. Is there now a single hole or Bridged TP?
I used primarily 18.13 pellets and 18gr slugs. The only time i had something fall into the TP and try and jam itself was trying to shoot Jumbo RS, and occasionally 17.5 NSA slugs would try to get caught, but, that was with the wide ported Single hole TP. This is the Gen 2 C88 TP unless it's been changed.
 
Upon looking at it closer, not only does the probe move, but it is bent upward towards the tip. Makes sense since you can clearly see with the single shot tray it presses the top of the skirt on the pellets and the maple mag it messed up was also in that upper portion.

Looking for a new probe now and straighten this one out and see if it helps for now.

Not sure if this pic angle shows it as well, but it shows itself a lot more in person.View attachment 557102
https://www.airgunnation.com/threads/my-notos-first-impressions.1315315/page-6 this thread will show the progression of that gun. The Cocking handle and some other things were changes after me. this is the liner receiver/tp/breech that should be in there.
gen 2.jpg

that gun is ported as wide as it gets. smaller pellets are just going to be an issue.