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Shorten Magazine Tube?

OldBob

Copper BB
The magazine tube on a new 590A1 with 18.5 inch barrel extends nearly 3/16" past the threaded portion on the muzzle end of the tube. When I screw on the nut, it must be pushed over the unthreaded portion until it catches the threads. Is there any reason not to file off the excess unthreaded portion?
 
Why shorten the magazine tube since it is working fine? Maybe sometime in the future you may want to add a +1 or +2 magazine extension.
 
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