If it's a containment rest you're looking for then you really need to take a serious look at the GKF Shoot Out. I have shot both the WB and the SO, and the SO is the better rest. The WB is nice AFTER you have made all the modifications while the Shoot Out truly IS the better design because modifications are NOT needed. Check out the new improved design.

If its a metal pin TR sight that you want then take a look at the new Micro Matrix, a much better design than the Alpha. The Alpha also feature crude adjustments that don't even come close to the adjustment ease of the Micro Matrix. Truly a refined generation of TR sights.