Walk into any gun shop or scroll through any firearms retailer online, and you'll find an overwhelming wall of handgun accessories promising to make you faster, more accurate, or more prepared. Some of these upgrades genuinely improve your firearm's performance and your safety. Others are little more than marketing dressed up as necessity. Here's an honest breakdown of what deserves a spot on your handgun — and what you can skip. Start With the Foundation: Why Your Holster Matters More Tha …