I've got a Criterion Pre-Fit for a Tikka in 6Creed that I've never fitted. Bought it second hand and came with an wrench for the nut. Looks to be a good system in theory, but you'd need to be confident in achieving correct head-spacing etc. So you'd need go / no-go gauges for each caliber if you wanted to swap about.
Definitely makes sense if you're wanting to just replace barrels of the same caliber though.
Would be best if it is used in a chassis system also, with a large barrel channel, as the nut diameter would prevent it being used in a standard Sporter stock I'd say.
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