Uber well m401 from m4a1

Ok guys just a quick question has anyone here got an Uber well m401 from m4a1(pre upgraded blaster) and have any experience with upgrading further and know what brand metal gearbox and/or gears is used in it and what would be the best spring to use

curious what is in one of those

but no, not here. my wells has only had the gears, piston, head and spring done

pushes 315+ with the standard barrel

loves LDTs

They go hard, if you mod them right.

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Same gearbox from a Uber wells, not sure they make them anymore.

damn…my wells seems positively sawft now :scream: