The best are the Pachmayr wraparound combat grips. They aren't pretty, but they are grippy without being mushy. They also have steel plates embedded in them that will protect your hands in the unlikely event of a primer or case blowout, which typically vents down the magwell.
Yep. You may have to relieve one corner of the grip to clear your thumb safety, but it's easily done with a sharp razor blade and nerves of steel.
