he sold it
Guy I was in a deer lease with had an A-bolt so equipped on a 7mm Mag. He found the blast with the BOSS so offensive from the shooting houses that he was carrying 'muffs around w/ him. He sold it an bought another w/o the feature.
I have also read that some guides disdain them and others flat will not take you if you show up w/ one. They are darn loud at the range from adjacent benches, I think especially with mag calibers.