Logic/experience. Many of us, myself included, wasted thousands on things that didn't work out. So far my favourite and most effective setup is a CQB M4 properly modded and upgraded. It's so versatile I can use it anywhere, but it can put high volume of laser-accurate rounds over two hundred feet away. Indoors it's certainly bigger than pistol, but the accuracy and stability makes effective. I always carry a reliable sidearm though. Going into very tight spaces (like a room) it can be a lifesaver. That being said, for killing multiple enemies and keeping heads down nothing beats an assault platform.
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BC & YUKON MASTER AV REPRESENTITIVE