SBR 9mm AR

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Originally Posted by jim

If someone has someone has a form letter to send to the ATF on permanent changes, please let me know.

Out of curiosity what do you need to amend? I listed 7" 223 and have multi calibers for the unit. Nothing is permanent just the orig applied for specs.

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I ended up with a 7 inch barrel and OAL is 2 inches shorter than listed.

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Originally Posted by sako55

Neat looking breaks but the thread pitch on my barrel is 1/2" x 36

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Bert can fix it for ya.

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Originally Posted by ChunkyMonkey

Bert can fix it for ya.

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I have the original 16" barrel that I have to send up to him. Thinking to have have him cut it to 7.5 and thread with 1/2 x 28 to have some more choices.

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Originally Posted by sako55

I ended up with a 7 inch barrel and OAL is 2 inches shorter than listed.

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Cut the 16" down to the length you have listed and you are GTG. The 7" one is not permanent as you can change uppers. I have a 7" 22 upper. it's not the OAL i applied for, its also not the permanent 223 set up either.
YMMV.
I know this was discussed here before, where who knows?