Well, the FBI, along with the Military, do their selecting in very similar ways. Always remember, they have to get a platform that is very easy to train to a very large number of end-users. That's going to mean;

1. No extra levers/buttons performing redundant/superfluous functions,

2. No controls of the gun that move in non-traditional directions/methods,

3. No fire control systems that have multiple modes of operation (DA/Sa).

In my experience, military and civilian occupations that require the use of a firearm, by-and-large, do not provide enough regular training for their personnel to get really (I mean intimately) familiar with their issued weapon. Remember, the weapon is only going to work as well as the dummy that it was issued to!

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Matthew 5:9