So this is odd.... I’m a stickler on racks, so thought I would test a bit.
My Matsui Radisson 43’s fit perfectly. The sample SunFly 43’s sit perfectly, but I don’t have a barrel to test fully.
What doesn’t fit is my barrel of Matsui 39mm WSOP Horseshoes- the square edge kind. I and get 19 chips, but not 20. (They fit in my 67.7 rack, so the BR rack is narrower- don’t have calipers, but eyeballing it, looks like maybe 66.7?)