For general applciations, Prometheus 6.03s probably offer the best performance for the price. That's what I've been buying now, whenever I can.
KM 6.04s also offer good performance.
Madbull's seem interesting, but note that it's coated and you'll run into problems if you try to cut it down. Since 4/6 of my AEG barrels are cut to custom lengths, I don't use them as much (I have one for a normal length M4)
Systema wasn't particularly impressive.
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