What is up with this hook on this M10 upper

Gaujo

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Early MAC upper. Does not fit my JAWS even a little bit. Trunnion is too tight, and there is this weird hook. What is it? Is there any way to use this with a JAWS? Is the trunnion bigger because modern M10 uppers are made to fit in a gun with reinforcement tabs?

Also, what's that button!?

 
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xdamagedx

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I think the hook in the middle is for a 1 piece pin that has a groove in the center. The hook is actually supposed to be pointing the other way IIRC. I think I grabbed mine and pulled it when it was off the receiver like that and it flipped back but wouldn't flip forward.
 

timkel

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It's an original Ingram upper, pre-auction. That lever needs to be removed and reinstalled for proper operation. Hopefully the spring and detent are still present.
 

Deerhurst

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What everyone said is true. My 73 PS M10 upper.is exactly like that.


For it to fit your jaws you would need to machine the trunnion where it mates into the receiver. Early guns lack that reinforcing tab in the lower receiver.

What button do you speak of?
 
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