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No AEG will give you decent groupings at 40 yards. If you can get 2" groups at 30ft, then you should be able to hit anything (remember, we're going for man sized targets at any given range and it only takes a BB or two hit to make the guy call himself out; case in point, my MP5 shooting around 370fps does the 2" groups, and have gotten most BBs on target out to 150ft away.)
I say you get your tightbore (6.03mm is fine, using quality ammo and keeping it clean will reduce if not eliminate any chances of jamming, remember that the biggest BB sizes measure around 5.92-5.94mm diameter, so that gives you 0.07-0.09mm clearance with a 6.03mm barrel), buy a Prometheus 110 sping (should put you around 360fps roughly) and a bearing spring guide, total fps should be around 385-390 fps, and gives you the wiggle room to constantly stay under 400fps. Some places are pretty tight about fps, I've seen guns that, out of 10 shots, 2-3 might be 403fps, be given a conditional allowance to play that one game day, sometimes even only set to semi. The best tuned guns out there will be off in velocity by +/- 3 to 5 fps, so don't bother screwing around trying to get 400fps on the nose, it's pointless. As you can see with my MP5 example, one doesn't NEED to be at 400fps to work right with 0.25g BBs. Mine has minimal upgrades, and outshoots most other AEGs.
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