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Chillywig

MPX mystery

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Took my mpx apart to have the receiver  set cerakoted. Just reassembled and have this part left over. Flat thin washer that won't go over a 1/4 20 grip screw. Any ideas? 

Screenshot_20180421-202301.png

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Washer off of one of the bolts that secures the barrel??

 

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Hmmmm - not sure. There was only one washer in my parts bag...

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Posted (edited)

Did you take the gas valve apart? Looks like a spring washer for it.  

 

Edit:

or I think there is a spacer behind the safety selector on the ride side. 

Edited by MrRick

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AHA!!!

 

I bet that's it. Safety selector seemed a bit more difficult to switch between safe and fire. I thought the cerakote may have been the culprit. 

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