One of the few options for left hand bolts - Stag Arms AR-15 Stag 15 Bolt Carrier Group

I bought this for a new build I was putting together. Stag has been my go to for bolts since all of my ARs are left hand, so of course they were my first choice. My previous two Stag left hand bolts were well made, I have one from 2011 that is also phosphate coated with chromelined inside and it has never failed me in the 9 years I've had it, I have never had a malfunction in that AR. my last Stag bolt was an ar10 nitride one and it too has been stellar and well made, no issues. This one that I just purchased, however, is not as good as the others. The phosphate coating on the one I bought was really rough, made cycling the bolt when I first got it a little tough. The other issue I had is the edges along the belly of the bcg (the bottom of the carrier) were extremely sharp compared to my other two bolts, it cut my finger when I first installed it and did a little damage to the inside of my receiver. Luckily noting else was out of spec, and a little bit of use and some deburring to the bottom edges made this bolt as good as the others, but I was a bit disappointed with the initial quality of the bolt which is why I gave it 3 stars.