Mag safety depends on the use of the gun. If you envision a situation where you are going to be in a fight / wrestling match with a bad guy, then as many LEO's will point out, being able to "safe" the gun by releasing the mag has some serious advantages.

If that is not the case, then you have a situation that could cause you to have one of two "also highly unlikely" situations:
1. You accidently drop the mag in a crises and are now holding a door stop.

2. You are in the middle of a reload when the need to shoot arises, and you are holding a door stop.

While all of these situations are unlikely, you decission should be based on which is the most likely to occour in your case.

__________________
Gerry