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Interesting. My glock 40 is ported the same as yours, I think it was done by aero tek?
But it doesn't have the writing on the top of the barrel.
But I agree, I think that is one of the better ways to port a pistol
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AroTek does a similar porting system BUT, what they do is High Temperature Silver Solder a "rail" on top of a factory Glock barrel.
Then they machine it flat to where it is a flat top on the barrel, then they machine a corresponding flat groove on the inside of the Glock slide where the "rail" is ALMOST touching the slide.
Then they cut the ports though the slide AND barrel.
AroTek porting job, if you look close you can see the barrel rail against the slide through the ports.
AroTek at one time did a porting job similar to mine, they would attach a tall rail to the factory Glock barrel and then cut a slot through the barrel like mine has.