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Hurricane mechboxes are damn good, but will still crack. A few months ago I replaced my piston in my MP5, and noticed a hairline crack in the usual spot, as well as up top of it along the curve in front of the cylinder. I rarely opened it last year, ran it shooting 365fps every second weekend for 8 months, so I wasn't sure when the crack started. I drilled a small hole at the end of the crack, and used Metal Set, aluminum filled epoxy, to cover where the crack is, figuring I could reinforce it a bit, maybe enough to keep it happy. Used it that way a few games, crack hasn't spread at all and gun is shooting fine.
Anyways, was a couple months ago I mentioned the crack to Apoc, and shortly after that he opened his SR-16 to see a hairline crack as well, so he replaced the mechbox. In that gun in particular, he previously had Systema reinforced mechbox, it only last about 2 months shooting 400fps before it blew and took the hop up unit with it. Hurricane mechbox lasted over a year, games every week or two for him.
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