Pickd up a few of those M16 30 round mag pouches w/ the grenade holders on the ends, $1.99 each at local Army and Navy....I trimmed the two tabs on the inside and my 20 rounders fit nice in these, two in each.....now, I was going to cut off the side grenade "holders", but before I do that, is there a reason to keep them in place?...what do YOU use these for?...thank you.