Notos customizing

[Firewalker]

Would like to know who is the grip frame made by in picture #78 thanks in advance.

Buck-Rail

 

[Squirrel hunter]

The Umarex Notos is my 2nd favorite airgun, right behind the Huben Gk1 pistol in a Carbine stock. I love compact airguns being I am only 5'7 and find some of the the airguns too long for my style of hunting. I like to rat hunt at night so I need a way to attach a flash light. With the new Bravo3d forearm or handguard attachment I can now attach a flashlight. The forearm has a picatinny rail and it also has 2 Mlok slots for more attachments. Check out the site www.bravo3d.com

 

[Rizz01]

A question was asked about barrel twist of the Notos in another thread, using a 6" long Cerrosafe casting I get a right hand twist at about 1 in 22" to the best of my calc. 91 deg. 24 min in the 6" lenth. I used a 4.0 mm carbon fiber rod to push out the slug. It was a kite kit but works great for clearing jams also as it won't mar the rifling. Last pic are various pellet sizer I made for my brother's guns.

View attachment 379841

View attachment 379842

View attachment 379843

Thank you, SO much for the barrel twist info. (Recently got mine) Haven't had the chance to check it and haven't found the info anywhere online. A 1:22" twist makes sense. I was bewildered as to why this gun is so accurate. Mr. Firewalker is doing some REAL mods to these guns resulting in higher FPS, and they are still shooting well afterwards. I guess UX "took note" and applied what FX is doing with their pellet liners.

 

[Firewalker]

Thank you, SO much for the barrel twist info. (Recently got mine) Haven't had the chance to check it and haven't found the info anywhere online. A 1:22" twist makes sense. I was bewildered as to why this gun is so accurate. Mr. Firewalker is doing some REAL mods to these guns resulting in higher FPS, and they are still shooting well afterwards. I guess UX "took note" and applied what FX is doing with their pellet liners.

The big difference that the FX liners allow for is the use of slugs, higher velocities and distance shots. I'm told that there are some changes coming for the Notos, nothing confirmed but the design of the gun would allow for more performance if Umarex decided to up the game.

 

[Genob]

Would like to know who is the grip frame made by in picture #78 thanks in advance.

It's from Terry @ Buck Rail, look at post #77 for before mods. I also opened the hammer spring access to allow spring removal/change without removing the lower section. Below is final version compared to my home made Prod, also now regulated with Notos reg and tank.

 

[xtc130i]

nice work. how did u shorten air cylinder

 

[Genob]

nice work. how did u shorten air cylinder

I do it on the lathe use parting tool. Then the inner diameter has to be machine to 27 mm before cutting the M28 * 1mm thread with a single point tool bit. Follow by doing hydro testing to insure safety.

 

[Genob]

Spent this morning testing my brothers Notos, we installed a 30 cal 450mm reximex barrel on it. We were aiming for 75+ fpe on this project. But had disappointing results, maxing out at 55 fpe with JSB 44.75s. We can't put any bigger valve on it due to the action block width. This test was done with 2200 psi reg pressure, so even turning up to 2500 will only gain another 5-8 fpe. So back to 25 cal it goes. Glad we didn't make a mag for it and waste time, lol.

 

[Pantanni]

This is an update on my Notos 25 cal project, I'm still not able to break the 30 ft/lbs barrier with the modified OEM exhaust valve. I'm stock at just under 30, I've gone as long as 20" barrel and it's actual goes down a little. Today I order an smooth twist barrel liner for FX, will see if less friction help. Current specs- puppet supply 5.2mm, transfer port 4.7mm, reg pres 2.8K, barrel length 16". Balance valve design is complete, mat'ls on order. More to come.

View attachment 379897

View attachment 379898

View attachment 379899

View attachment 379900

I have a notos that is currently leaking air through the barrel. I know my poppet has failed and I have a replacement on the way, but I've also noticed an o-ring has become unseated on the exhaust valve. I see in this post you've removed yours to port it. Id like to know how you removed the exhaust valve on this gun?

Thanks in advance

 

[Genob]

I have a notos that is currently leaking air through the barrel. I know my poppet has failed and I have a replacement on the way, but I've also noticed an o-ring has become unseated on the exhaust valve. I see in this post you've removed yours to port it. Id like to know how you removed the exhaust valve on this gun?

Thanks in advance

It is held by a 2 mm pin on the block. Once pin is out, you can the exhaust seat with wooden dowel. Use also a tapered wood dowel to push back the seat so you can orient the airway correctly.