Twenty years ago, I acquired a Bar-Sto 5" barrel in .45ACP, which I fitted to a Colt Combat Commander.
I had intended to shorten the barrel. I left it sticking out.
It shot so well that I was afraid of disturbing something and losing that golden edge, and so left it.
I still have the gun, and it still makes me smile when I shoot it.
When I do my part, it will deliver 1" holes at twenty five yards.
I have also thought about porting the end, the fears mentioned above, have probably kept me from making a mistake by cutting into it.
2 cents.