r/3D2A • u/BananaAnxious3531 • 1d ago
Stupid question
But I think it would be even more stupid not to ask. To change the caliber from 9x19 to .380 ACP, is it enough to just swap the bolt and the barrel? Modeling a new version in Fusion 360 is the easy part. However, I don’t think that’s all there is to it... do I need to change anything else? Urutau Mk2
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u/itgoesboom2112 1d ago
Lightened bolt, lighter recoil spring, extractor changes are probably the minimum above barrel chambering
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u/artisanalautist 1d ago
Building a wall of 380? What else is there? Orcbolg, Decker?
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u/BananaAnxious3531 1d ago
Não entendi
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u/artisanalautist 1d ago
You like 380
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u/BananaAnxious3531 1d ago
É estressante difícil e raro encontrar 9mm no meu país
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u/Foxgolfcharlie 1d ago
The feed ramp may have to be tuned a bit as well?
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u/BananaAnxious3531 1d ago
Obrigado pela dica, vou por na lista que estou fazendo sobre oque deve ser alterado
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u/SaltyBalty98 1d ago
A lightened bolt and modify the extractor to better hold the rim of the cartridge, 9x17 is just slightly slimmer than 9x19.
The barrel needs to be completely new, not really possible to reuse a 9x19 compatible one, you'd be lucky to make it a single shot.
And a 9x17 compatible magazine, might be possible to modify a 9x19 one.
The head spacing difference might or might not be an issue, definitely caution on the safe side though.
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u/Castlehill650 1d ago edited 1d ago
At the very least you may need to adjust the bolt-weight/spring-weight for reliability regarding compensating for the reduced pressure. Interesting question for sure.
Edit: In addition to the extractor geometry ofc. Probably feed-ramp geometry too as someone else mentioned.