just noticed that V3ECM is meant to build .22lr barrels from 8mm OD steel tubes, not 12mm. so there is no way in making solid steel barrels for handguns? must use a barrel liner mandatory?
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3D2A @fosscad.io Null-22 steel barrel specs
in order to make a solid steel rifled barrel for a Null-22, how long has it to be it in total? all chamber+rifling+thread Should it be 100mm long? I can't fin it specified nor in the readmes nor in nthe not-a-glock instructions, I only found the guide rod size which should be 3mm od x 70mm lenght. the immortalrevolt's guide for .22lr barrel making says either 114 or 144mm but that's not related to these pistols. please help any explanations on Null-22 or NaG are welcome, I like those builds the most since almost everything can be printed or built with common parts, but there is a lack of clear specs and instructions.
Also, anybody has experience making a rifled .22 steel barrel? planning on boring a 12mm od 5.4mm id tube to 5.51mm bore then rifle it to 6.64 than chamber it and die the 1/2x28 thread. any advice? could be an option instead to just "sand paper roll bore" the inside from 5.5 to 5.51mm?
thanks to everyone who knows this topic and will take the time to answer!
3D2A @fosscad.io .22lr showdown
In your opinion, as of january 2026, which are the best .22 semiautomatic fully DIY builds? simplest to build? most reliable and durable and accurate? most funny? I'm curious, I knew NaG and Null22, just discovered SY22, would like to know what is advised over the others and why
3D2A @fosscad.io .22lr ECM tube size
ImmortalRevolt's V3 ECM for .22lr (for null22 or not a glock). the README (first half) says to use a 8mm OD tube with 4-5.4 ID, the PDF (second half) instead says that .22lr barrels are made from 16mm OD tubes like othe calibres just with 5.4mm ID. so what is the right choice? is this for the suppressor thread? I think that 16mmOD is way too much for either NaG or Null22
thank you very much Martin! awesome explanation, I appreciate that. I didn't know this R17, very cool desing! it looks like much more complex to complete, but much more reliable and durable too! In the end I got my hands on some 5mm ID and 8mm OD tubes so I'll probably start with a barrel liner to put in a null for a quick project, but that OD12mm ECM and in general the R17 .22LR looks very promising! It will be for sure my next big project when I get some time edit: just understood the R17 is your own creation, very big compliments from my side! It is the most serious fully diy semiautomatic .22 handgun I have seen yet. Thank you for sharing this and adding value to this community! we need more people like you <3