In case some haven't seen it done.....
Here is a one piece Burris PEPR mount that was professionally lapped by the techs at Vortex. Lapping involves using a known true straight tube and abrasives to ensure the rings/mount are truly straight and the scope is evenly supported by said mount. Even the slightest bit of it beng not "true" can dramatically affect your scope's ability to hold zero across it's available range....
Here is a one piece Burris PEPR mount that was professionally lapped by the techs at Vortex. Lapping involves using a known true straight tube and abrasives to ensure the rings/mount are truly straight and the scope is evenly supported by said mount. Even the slightest bit of it beng not "true" can dramatically affect your scope's ability to hold zero across it's available range....