You can always get a hotter gun later on. My first gun and my preferred weapon is a bone Stock TM M4 S-system. It shoots 280 FPS, I have a tight bore and the ultimate hop up in it. I can bring it out at any field without a worry. For Indoor the ranges are fine and outdoor just use cover to get close enough to your target.
“We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.”
To those Rough men... Thank You.