Umarex NOTOS Owners and modifications:

I don't see a kit for it, only the 22 cal. I've made a few 25 cals using a Reximex Tormenta barrel (375 mm long). Other Turkey made barrels also work, like Kral available from Canada shooting supply. The 12 mm step needs lengthening a few mm, the transfer port can be elongated to match the Notos. I made my own pellet prove, but if you want a quick easy way to do it, find an empty 22WMR shell and cut the rim area. You can use this as a sleeve on the prove, it's just under 25 cal. I'm getting 42+ fpe with the 14.75" (375mm) barrel reg to 2200 psi.

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That's the pellet and speed im looking for. If it shoots kings, it's likely to shoot hades too. I'm looking to use ammo ive already collected. My old gen 1mrod is big and heavy for what it does so it's ammo needs to get used elsewhere.
 
That's the pellet and speed im looking for. If it shoots kings, it's likely to shoot hades too. I'm looking to use ammo ive already collected. My old gen 1mrod is big and heavy for what it does so it's ammo needs to get used elsewhere.
Don't forget to open all passageway, mine all 4.5 mm except the air block I opened to 6.5 mm. This was done because I wanted to try it as a 30 cal carbine, otherwise 4.5 mm will be good.

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yezzir! the fact that the notos is super mod-friendly makes it a joy to own! stock form is just as enjoyable, but mods are where the fun truly begins!
Tinkering is probably more of my want than a money pit, the notos seems like a fun option. I've gone down the fx slug cannon road 😅. You may have sold me on one even if I kept it stock.