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Well, got the M15 shooting now, rather low with the Prometheus 110 spring, 300mm tightbore and bearing spring guide (all the same as in my MP5SD except I have a 330mm tightbore, is shooting 395-400fps), it is only pulling off 350fps with hop up off. I replaced the hop up unit (put in a Deep Fire metal unit, with TM parts in it), and sorted out the sticking tappet plate issue I'd been fighting with. Turns out the DeepFire tappets are higher on the nozzle end, about 2mm higher actually, where the notch to hold the nozzle in is, it was binding at the bottom, the CA mechbox is a bit thicker there. I put in my MP5's tappet and it works like a charm, and even the Deep Fire tappet is working well in my King Arms reinforced mechbox, so I guess we both got off lucky. So, if I can't sort out the low fps (350fps is fine, but he's hoping for 370-380fps), I'm putting in the Prometheus 120 I have kicking around.
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