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File off some material from this area to eliminate any spaces allowing light to shine through.

Bettah!

That's the front of the barrel hood up there.
Shoulda labeled the picher properly.
Once the rear of the Barrel Hood plays nicely with the Breech Face, it is likely that only a little bit of material is preventing the front of the barrel hood from fully rising.

Give the barrel another whack.

Look for Witness Marks.

By now, you should have seen a pattern emerging...

Ohmigerd!

Let's whack it a few more times, for good measure!

One!

Two!

Three!

Yesss!

When "riding the slide," it should stop shy of a light tap into full battery; the above shot is simulated and slightly exaggerated.
Assemble the firearm, and attempt to "slingshot" dummy rounds - it should do so without issue, even if the slide was difficult to rack and / or the firearm was difficult to disassemble.

Even though one can rest with the reassurance of having proper tools (hey, that's a nice little Ruby Rod there!)...
NORTON INDIA STONES
NORTON INDIA STONES | Brownells
NORTON PREMIUM HARD ARKANSAS STONES
BROWNELLS NORTON PREMIUM HARD ARKANSAS STONES | Brownells
...the only tool I really used this time was the Ruby Rod as a platform on which I wrapped some 600 grit sandpaper :lol:
Personal Preference: Wet Sanding.
Masking Tape / Painter's Tape eliminates a lot of aggravation from unwanted scratches.
The light surface scratches that result from having inflicted "witness marks" are easily buffed out with 1200 grit sandpaper; again, with wet sanding.
Personal Opinions
1. The best barrels are the ones which don't fit from the get - go.
2. Do not file down too much material to the point wherein the slide is "smooth to rack." The slide must remain difficult to rack, and the pistol must likewise be as difficult to reassemble / disassemble.
3. Fit the barrel to the point wherein a very light tap from a mallet at the appropriate places is required to bring the necessary parts into full battery.
4. Do not polish mating surfaces no matter how much your impulses may demand it.
5. Fire a full cliiip clip clip clip, checking for battery each time - if done right, cycling the weapon by firing will smoothen and polish the relevant parts by peening. Things will "smoothen out" after around two boxes of ammunition.
6. Compared to Glock barrels... Bar - Sto barrels seem very soft.
Speculation
Even if we took material from the rear of the Barrel Hood alone, it's doubtful that any hazardous headspacing issues will occur. Within common sense, it's probably difficult to effect a catastrophic bubbafit, given how Bar - Sto specs their barrels.
Disclaimer
I no be tacticle. I no be alpha sheepdog warrier.
My firearms no be toolz, only toyz :lol:
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