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The stock barrel is pretty restrictive.
I put a CA High Precision 6.04 300mm (M1A1 length) in my M15A5 CQB last weekend and the fps went from 290-300 to 330-ish ... with no other mods...
If you really want to pay double for a 6.03 you'll need a MC51 length barrel (285mm) from Prometheus.
You might want to note Stokes' M15A5 CQB shoots around 330-340 (lucky bastard!) with no internal upgrades, and i've heard some reports as high as 360fps stock... so CA needs to improve their QC. All Marui AEG's pretty much shoot the same out of the box.
Overall though the CQB is a well built gun, which is refelcted in it's high price, and would be perfect for indoors with just an inner barrel upgrade.
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