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prometheus MAKES a 6.04 barrel? lol
systema is 6.04 but i've heard of jamming problems. Honestly I've heard of problems in every tightbore, I've got a 6.03 and it's never jammed.
why not buy a cylinder head? air nozzle? and most importantly: shims!
without shims your guns only going to last a few mags before you start getting problems. And if your pushing for 400fps, might as well try to find a prometheus hard hopup rubber
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