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Ultrasonic cleaning MPX


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I am looking to use a ultrasonic to clean my MPX. My question is does anyone know if there are any MPX parts that would not be safe in the ultrasonic cleaner? I am primarily worried about the BCG and the tappet and piston along with the o-rings on those parts. I am keeping this question broad to get good conversation going.  



Edited by Nitro1
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34 minutes ago, Nitro1 said:

What do you think of putting the upper receiver in an ultrasonic? I am only worried about the finishing really.  Figure it will make my life much easier to just drop it in the US and walk away. 



Done that a dozen plus times, not a problem. Just dont run it more than 3minish

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