I recently sold my Scorpion EVO, but it was an absolute blast, so I'll pass along my (subjective) experience with it.
First of all, that thing is warrantied for a year, and if you use it as much as I did, there's a decent chance it saves your ass. One of the gears in mine stripped teeth, the ETU did its job and locked the gun out until I got it fixed. Just paid the shipping back, parts and labour were free. I hope you never have an issue with it, but any gun - especially stock - is going to break eventually. One thing about the warranty though: using non-ASG springs voids it, so be careful about what you use in the quick-change spring system.
I used a T1-style red dot on it with a killflash. Looks great and I like it much more than a Lexan sight protector. I found an AFG to be very comfortable as well. If you play really claustrophobic CQB like I do, consider running it with the stock detached. Folding the stock gives you a wider grip if you like to grip around the magwell, which is generally best in ultra-close quarters. Very ergonomic.
I wouldn't personally buy a tight bore barrel unless you're getting something high-end (e.g. PDI or Prometheus with an r-hop). The barrel that comes stock in the Scorpion is probably at least as good as half of the 'upgrade' barrels out there.
As far as mags, for close-up indoor games I used a loadout of 4 magazines (which was usually more than I needed), and for anything else I carried 7. Didn't bother with anything but the mid-caps. If you're looking for solid retention pouches that don't cost an absolute arm and a leg/custom job, I used the Tasmanian Tiger Large Pistol mag pouches ($20 each) and they worked awesome. They'll be tight and awkward at first but you'll get used to inserting mags quickly, and they come out not problem. Recommend coming in sort of at a diagonal when indexing mags into them. You'll be doing it one-handed in a game or two.
The drain on your batteries isn't affected by your BB weight. Personally I liked .32's in mine, your mileage may vary.
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