Im glad your debunking this barrel brake in bs, its a scam as far as im concerned. I remember a guy at the range telling me I pretty much ruined my DTA barrel because I didn't brake it in and I would regret it. As you point out yea maybe in years gone by that a barrel needed to be run in but today with cnc precision its a thing of the past. Just look at cars and engines, there is no run in procedure anymore, im a diesel mechanic working on power generation and its not uncommon to install a generator and have it at almost full load instantly and that engine will run for 20 000 hours!