Popular opinion on the Magpul BAD (Battery Assist Device) lever is a mixed bag:
- Critics claim that the lever can interfere with bolt hold-open and also that teaching yourself to use one could be a problem if you end up using a different rifle that doesn't have a BAD.
- Proponents like the fact that this device moves all the rifle controls to the control hand. The paddle control is now accessible on the right side of the weapon.
My personal experience is that the lever is a major upgrade to the AR-15 platform. My control hand can operate the entire rifle and bolt locking and release is far more intuitive – after just a short amount of trigger time using it becomes natural. Check out this video demonstrating the speed the BAD Lever adds to reloads: