All 3 of mine were done by SSS during a T&T. With no disrespect at all to them, I never really like how loosely the the 38spl case fit the sleeve inside the bolt. I removed them from mine and replaced them with one that I made that perfectly fits the sleeve and holds a small ball bearing. They were pretty easy to turn out on the lathe with some brass rod I had.
I have one other savage that is all factory and has never been touched. I plan on doing it when I get the time. I have not decided if I want to make a spacer, or shorten the BAS. The spacer would be easy to make, but look ugly. So I am thinking shortening the BAS. I will just have to figure out a good way to hold it first. But before I do that, find the time to do it!