I don't see the difference between engineering a featherweight weapon and a heavyweight weapon apart from the size difference. Old skool heavyweight style weapons are the ones to look at if you don't have much spare cash or engineering skill. A spike on a pneumatic ram? An angle grinder gearbox and disc attached to a bosch 400? Its been forever since I last saw a chainsaw on a heavyweight! And they are the style of weapon that is good to watch but doesn't do much damage.
Since the featherweights have been brought into line with the USA how many machines have made the trek in either direction? None that I'm aware of. Build to a kilo, a nice easy weight to remember and build to.
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