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Click on google and put beartrap recoil reducer and it will show you what they are. We had 338;s that were identical and one had a beartrap one did;nt and there was a huge difference. I just don;t like muzzle breaks I know they work and have had them but the noise and blow back of dirt bothers me more than recoil.
It;s a mercury switch that they put inside the butt of the gun. It looks like a little co2 cylinder they just remove the butt pad and epoxy it in and put the pad back on. I have a 300 ultra mag that had the plastic stock that had a bad recoil and Dave put one in and it;s nice to shoot now.
Here's the site for info and description. Order online:https://beartrapusa.com/Home_Page.html