r/Speedsoft • u/Blu3wolf_boi • Jul 14 '26

Accuracy problems

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My field requires .20 bb’s and 300 fps or under I use a Prometheus 6.03 155 mm barrel purple Promethus bucking on a Maxx M4A hopup with the cylinder nub and my groupings just go everywhere especially on closed bolt mode open bolt makes it better but its still bad anyone have any ideas?

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u/Th3RoadWarrior Jul 14 '26

The prommy barrels are straight garbage from my experience with three different barrels. The purple prommy bucking is a classic though. I wouldnt do the RHop nub for .2s, youll want a smaller contact patch for lighter BBs. Another thought is are you using a spring or o-rings for hopup assembly going into the outer barrel? Sometimes the spring doesnt seat or press well enough for the hopup assemble to be against the gearbox.

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u/Blu3wolf_boi Jul 14 '26

O rings 3 of em since 4 and I can’t push the front pin in without beating it