You need to mount the receiver in a rigid vise in a milling machine and small center drill the tit, then drill with a bit slightly smaller then carefully/slowly using lots of oil drill the top/post/tit of the plunger, then with a 1/4" end mill slowly machine the post down to the base of the stud/tit.
Finally/slowly use an end mill to machine down the plunger below the post/tit and it should rotate/break free so you can pick it/spring out of recess.
Its possible the plunger will rotate and pop out at any of these stages.
Trying to use a hand drill or drill press without a rigid hold device will result in the bit going off center and gouging the walls of the plunger and or drill into the receiver causing you a BIGGER problem.
Finally/slowly use an end mill to machine down the plunger below the post/tit and it should rotate/break free so you can pick it/spring out of recess.
Its possible the plunger will rotate and pop out at any of these stages.
Trying to use a hand drill or drill press without a rigid hold device will result in the bit going off center and gouging the walls of the plunger and or drill into the receiver causing you a BIGGER problem.

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