The sets are designed to be used with a variety of thumb safeties, but remember that there are a lot of things that come into play when fitting parts. Safeties are either cast or MIM, and variations from manufacturer to manufacturer are common, as well as individual parts that may not be perfect. You have to treat each as an individual job rather than generalize. We use a lot of Brown and Wilson safeties, and we also have to reject and return a fair portion of these for warpage, cracks, and size related defects.
Nothing's perfect, but...
Where there's a will, there's usually a bigger hammer

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Heirloom Precision, LLC.
480-804-1911
Far and away the best prize that life offers is the chance to work hard at work worth doing.
TR