Prowin Hop chamber require fettling in most guns, and rarely work with anything made by Ares reliably.
BB weight - use the heaviest that the hop unit can lift to a flat trajectory, in the case of Ares Amoeba's stock hop chamber, you'll be damn lucky if it can consistently lift 0.25s let alone 0.3s.
(below is borrowed from elsewhere - but is generally relatively correct)
- 280-300FPS: No heavier than .20g; however if your hop up is better than average, shoot for .23g.
- 300-350FPS: .25g if your hop up can handle it is a good way to go. .20g still works well here and is appropriate, but try a little heavier like .23g or .25g.
- 350-400FPS: With this velocity, aim for .25g up to .30g depending on your hop up set up. Properly tuned rifles with this BB weight will outperform those with lighter BBs at range.
- 400-450FPS: Going for a DMR set up? Try at least .28g and with proper hop up adjustment, .36g is achievable with exceptional results.
- 500-550FPS: Long range marksmanship requires the heaviest and best BB you can afford. .32g up to .43g is suggested for those who want that "whistle" sound when a heavy BB with good backspin penetrates the air on its way to the doomed target. A patient, meticulous technician and shooter should be able to achieve 250-300ft range with his or her rifle.
Inner barrel - ZCI are lower quality barrels than even the stock inner barrels in Ares guns, so that is a waste of money.
A wider inner barrel will improve range, but the dispersion will be greater. To counter that you employ something like a flat hop nub, R-hop etc along with the heaviest bb weight that your chosen setup will lift to a flat trajectory.
A tighter inner barrel will seriously impact the range, but also greatly improve the tightness of the groupings.
- Best CQB barrel: PDI 6.01 (Value choice: Madbull 6.01 or PDI Raven)
- Best Mid-Range barrel: Prometheus 6.03 (Value choice: Madbull 6.03)
- Best Long Range barrel: PDI 6.05, 6.08 or Orga 6.23 if enough air can be supplied, as the Orga will have the best effect on range. Orga also sells a 6.10 barrel if you cannot supply the air for the full bore 6.23 (Value choice: None, high performance = high cost)
- Avoid stock barrels and cheap barrels (JBU, Classic Army, low-grade steel barrels, storebrand barrels, etc.) and do not believe advertisements claiming a £15 barrel outperforms a £90-120 barrel - this is simply not true