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Do you have the muzzle brake? If not, it'll stick out past the muzzle... my 14" is below my 11". Maybe a +1 and the muzzle brake would be close to flush... might defeat the purpose of having a shorty shotgun if you are going to add 5 inches to it.
I'm sure the +1 and Muzzle Brake would look good and bring it up to 6+1.
I see the +1 Extension on the STF-12 w/brake which brings the 11" barreled shotgun to 5+1 and makes it's OAL close to the 14" version without the extension.