I don't think those are bridgesii. Bridgesii have long spines, and are much smoother looking. These look almost jagged, like the teeth of a saw blade. If anything these are some type of pachanoi, but that's ok. San Pedro also contains mescaline, the amount can just be very inconsistent. Some specimens can have a lot, and some can have nothing. True bridgesii is much more consistent when it comes to alkaloid percentages.

This is a picture of my current bridgesii.