One thing to consider, if you use the Pierce +1 extensions, magazine exchanges take a little more mechanics. I noticed this a couple of weeks ago on the range. My hand was keeping the mag from dropping free and I had to sling it out to the side or rip it out with my left hand before reloading. It took a little more thinking under stress and added some time to my reloads.
"I do not love the bright sword for its sharpness, nor the arrow for its swiftness, nor the warrior for his glory. I love only that which they defend.”
-J.R.R. Tolkien, The Two Towers