Better than the orher option - Phase 5 Weapon Systems Inc Extended Bolt Release V3

Installed on an Aero M4E lower, fits just fine. Less slop than the BAD lever, also the finish and functionality are better as well. In my opinion this is a much better design. (One piece instead of attaching to the existing bolt catch)
Be aware it will take up a decent amount of space in your trigger guard, if you wear gloves they will probably rub the lever slightly.