Suppressors Aem5 / 12th model brake specs? / length?

[deersniper]

I have an extra Douglass barreled upper and some ops inc aem5 brake parts laying around

Can anyone tell me what this distance should be?

 

[camocorvette]

 

[camocorvette]

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[camocorvette]

Hopefully that helps ya out.

 

[deersniper]

Found this mine is 2.33 so il shim it a little