You can get repeatable return to zero when you you torque the barrel on. And it doesn't take so much torque that you need a barrel vise. I've been swapping barrels on TL3 's for years using wrench flats and crescent wrench. I'll make this bold statement: there's no method that is faster or more repeatable. All the AI style clamping methods have a weaker grip on the barrel than torquing the large barrel threads. And they require you to orient the rifle so an Allen can be used to tighten or loosen the clamp, then swap grips to orient the rifle up to unscrew the barrel. When you are torquing the barrel on you just torque, screw, and unscrew in the same orientation. We're mincing about a couple of seconds but the fact is it's faster. And provides a more consistent RTZ. It's one of those situations where the more complex solution isn't better.
The more specific issue with the BARLOC and Switchlug was when a barrel suffered a hit or impact laterally people found they had large zero shifts.
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