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Hi all. I try to use my mr223 upper with bushmaster ar-15 lower, but firing pin can't to strike primer. Any recommendations? Thank you!
 

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Some of the hammers are too short for the HK uppers. Get a hammer that is a little higher, DPMS, and it should work fine.
 

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There was a similar post on an MR556 upper. The front face of the trigger can't have a notch at the top. It needs to be solid or higher at the top to move the firing pin safety that HK has on their bolt carrier.
 

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