If your getting op rod wear from your SAI mount, maybe it's just me, but than you need to remove some aluminum from where the mount is contacting. After all, it's just an aluminum mount and you can always take it off after you fit it and recoat it with Gunkote or Alumahyde II.
I know guys don't like to think about fitting parts though and would rather just piss and moan about it.
It's not hard though and the M14/M1A is about fitting parts in a way.
For more mounts, you'll also got the Amega Ranges mount as a choice and a Knight RAS if you can find one for a reasonable price. There's also the Vltor Clusterfuck rail if you can find someone selling theirs.
There is definitely room for someone to make more handguard mounts to me, but we've got what we've got rigt now. There's the UTG too, but that's airsoft quality to me.
Amega