OLP were licensed by Music Man to make copies of their instruments for a few years (The name OLP stands for Officially Licensed Product) but then Music Man decided to bring the low end copies in-house and started the Sterling brand in 2009 (which becomes confusing because Sterling is also one of MM's bass ranges. Their OLP MM-2 bass (I had one for a while) is remarkably similar to the PBG MMB-4 kit.

I must say that having played a Sterling AX3 and a Music Man Axis back to back at a guitar show, they were very similar indeed in weight, shape, feel and sound. I almost bought an AX3 there and then, but was trying to be good at the time.