Has anyone ever used this...

FF Kit 303 Cal

Among precision shooters these kits have a good reputation for speeding up barrel break-in and improving accuracy. I doubt this would be worth it on a well broke in milsurp rifle, but I have an all but brand new Mk2 that has about 20 rounds thru it total and hopefully in the next 6 months or so I'll take possession of a faux-(T) I've had Criterion re-barreled and stocked. I'm thinking about ordering a couple of thee kits... Has anyone ever tried them out?
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