I'm getting some STOS broadheads and want the best/strongest/best fitting steel 100gr adapters. anyone have a suggestion?

The Premium ones from 3Rivers.I believe Braveheart has them also.

Kustom King also has two different ones.  If you order by phone you can request the better adapters.  I don't know the price difference.

Larry, thx, I called Custom King and was told that theirs are made by the same manufactorer as 3 Rivers, but are made out of stainless steel instead of regular steel.