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I've simply screwed them on...and they seem ok. Technically they're not fully seated into the recess in the mag (i.e. compared to the stock valve).
I've also used a lathe and turned down the diameter of the head just a bit to have them seat nicely.
Both work nicely although a buddy said the other day that he's not had good luck with the MB valves. I haven't had one fail yet...so dunno.
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