I'm not sure which model of M2 you're looking at. I bought a new M2 Field this year for turkey hunting. I overlooked the fact that the Field model does not come drilled and tapped for a scope mount. There are folks on this and other forums that say, because of the receiver thickness, it shouldn't be tapped. They've had the threads strip from the recoil. That might be something to keep in mind if you're thinking about mounting a red dot or scope. With the M2, your options will be limited. I don't know about the SBEII.
