Gimic or not? Benchrest shooters, starting with the rimfire guys, have been experimenting with "Tuners" for some time. Calfee has written a ton of info on his different designs. A few people showed up with tuners on their Unlimited guns last year and the NBRSA legalised them. The IBS followed suit at this years winter meeting. Can they be of any use on a hunting or plinking rifle? I doubt it but, in the never ending quest for extreme accuracy, the tuner seems to have arrived.