Quote Originally Posted by brutal View Post
I filed 1/13/15.

I should probably file my 300BLK SBR now that I've decided on the barrel.

Question for the brain trust. On my 7.5" SBR submissions I used 26" overall. Does it make sense if I'm filing a 9" to just use 27.5" for the overall length or is 26" some magic number to use?
Go with 28" you can go smaller on the gun. Over the number submitted, without applying for (what ever it's called) possible problems.