I just heard about something called a barrel donut, I guess they are for vibration and recoil damping?
All I could find on google was patent info.
Are these thing real?
Do they work?
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Talking about a barrel tuner? Those things are real.http://www.webspawner.com/users/bugholetuners/http://www.benchrestspecialties.com/barrel_tuners.htmhttp://www.varmintal.com/a22lr.htm