Great if adding a bad lever - POF USA Universal Bolt Catch Black Anodized 00667P

The paddle is pretty standard Mil-Spec size; the lower catch is where it is advantageous over a regular Mil-Spec one. Much easier to manipulate if you don't exclusively use a BAD type lever. I like Parker Mountain Machine's version better than Magpul. Feels way more solid and the clamshell design is superior to Magpul's tiny screws.