Not sure if it's a matter of over-kill, and at times a B.U.G. might seem necessary. However, it's a mute point in NM since it's illegal to CC more than one. If your state says otherwise, maybe you can make it work...I've always felt that what you have in your mag should be sufficient in a defensive posture. Anything beyond that: "
cover & the Calvary"....
The endless points of a failure in your primary piece are narrowly restricted to those that are unfamiliar with their weapon. Let me count the ways.......