Someone put together a website listing the manufacturers who have decided to decline sales to LE, where civilians would not be allowed the same sale: http://www.thepoliceloophole.com/
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman