The drilling on that pipe looks a little wonky but not terrible. I have a perfectly drilled straight Peterson that smokes great, but all their curved pipes I have looked at have (in my opinion) sloppy drillings. Peterson is unfortunately somewhat known for this issue, though I understand their quality control has been improving lately after being acquired by Laudisi.
The bottom line for me is that if a pipe gurgles, I don't keep it. Simple as that. Even some otherwise reasonably well made pipes can tend to gurgle for one reason or another. I don't really care what the cause is or whether I can identify the cause. If it tends to gurgle, it goes. I'll give them all a fair chance though, as many things can apart from the pipe can cause gurgle, including wet tobacco, humidity, and smoking technique.
Wanted to bump this with a quick update. I figured out an easy fix for the gurgle, simply by packing my tobacco a little bit tighter than I normally would. I actually prefer a bit firmer draw, so this doesn’t make me shed any tears. I’ve been packing on the loose side out of some possibly misguided sense of caution? Who knows... at any rate, when I felt a slight gurgle I tamped my bowl down with a bit of firmness that I don’t normally employ, and the gurgle vanished. Nary a whisper all the way until the end of the bowl. I suppose this makes sense, less volume of air equals less moisture flowing into the draft hole? Anyway, if you find yourself smoking a gurgler maybe try and give it a firm tamp and see what happens. Worked for me today! Best smoke I’ve had out of this pipe.
It's possible that the gurgle can be caused by slightly moist piece of tobacco being stuck in the opening of the draught hole. Sounds like that might've been the cause in your case if the gurgle stopped after messing with the tobacco in the bowl. What I'll call "true gurgle" is caused by moisture in the draught and/or mortise. Tobacco shreds are the cause of probably 2/3 of my "gurgles" on the occasion that I get one. I just run a cleaner through and push the shred of tobacco back into the bowl. With time, you can learn to identify a true moisture gurgle vs. a "gurgle" caused by a piece of tobacco in the draught.