Who makes a good SCAR for a good price? How is the ROF? How accurate are they? How upgradable are they?

D-boys makes a good one. Its not the best "replica" but all of they have flaws under high scrutiny. They are ~$200 I think. They use a V2 Mb so no issues with upgrading. Battery space may be an issue and may be an issue if you want 20+rps and you don't like LIPOs. I've heard good things about VFC and Ares but you'll pay almost twice. Airsoft GI has the back and tan versions. If you need rof get a G&P M120 motor. It'll bring 20rps with a large 9.6v and 30rps oh an 11.1v lipo with a 400FPS spring. Understand that higher rof is more than just upgrades if you want it reliable.