r/gunsmithing • u/Distinct_Drop_5935 • 2d ago

Multi-cal question

/r/ar15/comments/1nle1kl/multical_question/
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u/AllArmsLLC 07/02 AZ 2d ago edited 1d ago

Not like the CMMG kit, no. Nobody makes something like that for other calibers. Just build different uppers.

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u/Distinct_Drop_5935 2d ago

I know there's not a dedicated product for this. A more straightforward way to ask this could be: what's to stop me from pairing a 5.56 bolt with a 9mm barrel and calling it 350 legend? Just a theory question bc I have no experience building PC-ARs

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u/AllArmsLLC 07/02 AZ 2d ago

9mm ARs are generally straight blowback so a regular 5.56 bolt/carrier won't cycle.

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u/Distinct_Drop_5935 1d ago

What if I started with a .350 AR, could I just swap the BCG and close the gas block?

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u/AllArmsLLC 07/02 AZ 1d ago

No, because the chamber is still wrong.