Here is what Brown Precision says about it:
This stock is designed specifically for Silhouette shooting. This stock is inletted for the Remington short action, will take a large No. 6 barrel and has a full magazine mortise molded onto it. The comb and toe of this stock are just legal by the rule book. The comb is constructed of a tough fiberglass inner shell with 1/2" of hard - but easy to file or sand - material on top. This way you can easily remove extra cheekpiece to suit your own taste and not affect the structure of the stock.
Here is Brown Precision's website:
http://www.brownprecision.com/SilhouetteRifleStocks.aspI have one of these with a Kimber HS stuck in it. The biggest difference I see between the two them is that the BP has a rounded for-end. It is also heavier. I don't know if it fixes the difficiencies of the Nesika Bay, but is tailored for a different type of shooter style. Using the Nesika stock, it's square stock can be uncomfortable if you rest the stock between fingers, or grip it. The Nesika seems to be more aligned to a shooter who rests the gun on their fist. Really it comes down to preference, you need to give them both a try.
C Hunter