Ya, I find that even 0.25g are too light (within 30-50 they are ok, but past that they tend to suck) at times. Heavier is more stable, period. Sounds like the only way you are going to get any kind of decent accuracy/consistancy is to use heavier BBs. Incidentally, in my 30ft basement range, I can group 0.25g with my G19 about 3-4" or so, which is a hell of a lot better than it did stock (CD sized grouping was a dream back then, had to settle for shot placement all over a sheet of paper).
Measured (roughly, hard to measure a rubber O-ring with calipers and get a good reading............ case in point I measure the stock one, get 6.5-7.0mm ID, 1mm thickness yet OD measured............ checked all at least 4x......... 10mm). Anyways, the O-ring I use in my G19s is ~0.5mm larger diameter and 0.5mm thicker than the stock one.
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