Have not owned a muzzle break, and having been around a few have no desire for one. Can't really see how it would break a scope, More up and down recoil perhaps. Air rifles seem to be the ones that can really put the hurt on a scope. Again it would depend on the caliber and what scope. Have had some heavy kickers, and it comes down to the scope and the load. A good scope seems to be fine, a cheaper one not so much. For a 270 I see no need at all for a muzzle break.
