Check for a burr on either the safety or on the hammer where the safety engages. I have had safeties that are next to impossible to engage, but never had one that wouldn't release. What are the marks on the two items?
Hawk: Springfield Armory now uses repro hammers in their trigger groups for the M14. If you have 28287-2 cast into the hammer's side it is a repro. On the GI the marking is on the surface that strikes the housing when fired.
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