I would assume that a Bruce Gordon bike's BB has been faced. The outboard BB's use radial bearings that aren't the best choice for our use. They aren't designed for lateral loads and with uneven pressure you may be putting more of a side load on the bearings.
Enduro has an external BB with cups and cones, but it comes with ceramic balls and is very expensive.
A crank that uses old square taper bottom brackets might be cheaper in the long run and more reliable.
This is a good one: http://www.bikeparts.com/search_resu...p?ID=BPC314973