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One guy on M4carbine.net designed a buffer that had an extra bit of surface sticking out that would lock into the carrier to keep it level during travel. But then disassembly became a bit of an issue because you needed to move the upper forward to disengage the buffer.
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Smith & Wesson went with simplifying instead of complicating things and milled a bevel into the bottom edge of their buffer assembly. It acts like a ski, and keeps the assembly from busting up the buffer tube.
Works really well, I'm still not seeing any abnormal wear and tear in that region of mine. I've lost track of my round count. it was at 2500-3000 about 6months ago