All right, so I fell down one of those Internet rabbit holes.
According to a not-so-sketchy source, they are indeed based in New Holland, PA. There's nothing to indicate that they produce everything in-house, but there's nothing to indicate that they don't. The not-so-sketchy source that I found opines that much of their inventory is imported from Pakistan (as Knarfeng gently implied), and they (BnB) told this same blogger that they have QC people "who maintain a high standard throughout the entire process of production".
Is it an AISI or SAE standard? We will probably never know.
Much of the inventory on their website looks like the same thing you will find on DeBay, or Ali's Express overseas wholesale site. Their promo video even includes footage of a knife that is not listed anywhere else on the site.
My guess is that they import 99% of their stuff, and stamp it with their trademark. It's possible that their "custom" pieces are made in-house, by holding them against a belt grinder until they achieve the required shape.
Knives like this are almost universally scoffed at, here on BF. This isn't the thread to list why that is (I'm pretty far off-topic, already), but I felt that the OP should be aware of the fact that BucknBear does not seem to be very transparent about their products.