A friend of mine has a Surefire X300 on his home defense gun...it's a great light and I probably will pick one up for my P2000, but from what I have learned here, lights keep getting brighter and smaller every day...so my question is, why don't they make a real compact light for handguns? The Surefire takes 2 cr123s as do the Insight and Streamlight (although the Streamlight TLR-3 does take only one, but its is still a bit bulky)....can't they make a single cr123 with a narrower body/head that will work reliably? Is that these lights have to be overbuilt due to the recoil....just wondering...