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AR15.COM
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10/21/2024 5:54:33 PM EDT
If someone knows, or could measure their MP5 firing pin rear shoulder (flange) diameter,
and the bore dimension of a locking piece,
it would be very helpful.
My firing pin shoulder diameter measures .2560" , but a new production locking piece has a .2555" bore.  
Other locking pieces measure around .265"

I can easily reduce the FP shoulder to make it work, but am wondering which part is actually at the outside edge of spec.

Thanks very much.

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