The Choate folks of stock making fame make
(or used to make) a barrel extension/ flash hider
that does what you're asking about. It's already
blued and has a hole ready to put a bead of weld
for permanent attachment. When I was trying to
make my 30/30 shorty, 16 inchers just weren't
to be found, and I went with this. No regrets,
shoots as well as it ever did, and I enjoy embarrassing
folks with high dollar bolt guns at my rare public
shooting range trips when we go downrange
to pick up targets. I'm not really any better, they
just can't figure a short gun like that shooting
with their firearms.
( it's a secret called practice)