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hey check out this cool gun. This is the .950 JDJ Fat Mac. It is a 100 pound, 5 foot long rifle that shoots a one pound solid brass bullet at 2200 FPS. it produces 52.5k joules of muzzle energy. comparatively, a 5.56 round produces 1800 and a .50 BMG produces 20k. a 20mm autocannon round produces 53.5k.

this is classed as a Sporting Rifle in the US and anyone can buy one at 18. why anyone WOULD though is beyond me, unless you need to hunt aircraft carriers