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Dude, you need to start reading what you're posting yourself.

"The length of ANY (THAT MEANS ALL) firearm is measured without any “attachments” (whether or not
“permanently” attached (e.g....

None (legally, see what systolic says below), it's the just way the police explained how they measure the end of the barrel.



Basically right. Personally not aware of examples where under 4"...

No, absolutely not. And anyone telling you otherwise will land you in hot water my friend.

As police have said in their "Measuring length of MSSA Firearms classification approval" document:
...

Muzzle brakes aren't even included in police's OAL policy.