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Pop can chrony = bad
Gear timing = just plain wrong (sorry, no personal offense meant)
If the AEG reliably shoots 330 with one spring and there aren't wild deviations between shots...then simply dropping in a stiff spring should result in a higher velocity.
Things that mess with this are:
1. You screw something up with the previously good airseal (but George swapped back to his "old" spring and got the original results)
2. You have an extremely long inner barrel for the cylinder that you're using
3. You have a short barrel for the cylinder that you're using.
While the Dboys stuff is utter junk and not worth the $10 of savings vs. good parts...once it's working, it should continue to work.
A stiffer spring will not alter the nozzle to hopup fit (although this can vary between assemblies...especially if you're not consistant with tightening the stock screw).
It's really odd, because if he's using the stock inner barrel length and it's a ported cylinder...simply dropping in a s120 should net a 60+ fps increase. 30-40 if it's a really sloppy setup.
On a non-linear spring the tight pack of coils go at the back. On a Modify S120 spring, IIRC it looks more like a linear spring (at least the two I have left are not easily identifiable as non-linear). I strongly suggest you try a Modify S110. Depending on the rest of your setup....that should put you between 360-390.
Or....put it aside as a backup...but a G&P complete mechbox. Sure it costs $200 or so...but 2-3-4 evenings struggling with a problem mechbox that you end up with little to no confidence in, sure makes it seem worthwhile.
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