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PDI 170% sprigs are shorter anyways, but for the most part I haven't experienced any BS from them, they are super easy to install, and only heard of one local account of a 170% spring shooting 450fps.
I pretty much just posted this because I got Jackal's new M4 last night to upgrade and saw the sprinng he got was a 150% and measured it, sure enough it was 7" and thick wire, so I let him know and what could happen (busted mechbox within a short time) and he promptly ordered a (recommended by me) Prometheus 120 or something from Illusion. Just that every 150% spring I've seen in the past 6 months have been too long, too thick ad too hard to install.
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