I put a 510 mm miracle barrel in a stock G&G M14 EBR and tested it in the back yard recently. I haven't taken it to a field yet but over approximately 75' I was able to hit a golf ball sized target 10 out of 10 shots and the BB's took an identical trajectory and flight path every time. These were .32 Bioshots and I have a Maple Leaf 80 degree bucking on the barrel. I look forward to testing the consistency over more realistic Airsoft engagement distances but I'm encouraged by this small test.
As a point of reference, my VFC M4 with a 6.03 Prommy tight bore and an R-Hop was about 75% as accurate over the same distance.
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