Dennis,
Two things occur to me.
One, the failure to **** the striker is often caused by a sticky disconnector pin. If you take off the sideplate, you will see a round, spring-loaded pin sticking out of the front of the sear bar--this round pin is what the trigger lever actually depresses to fire. Press it into the sear bar and see if there is any resistance to it coming back out smoothly.
A note of caution here, the striker pin on a Luger sticks out a fair distance from the breech face, and going into battery uncocked on a live round could result in slam-fire.
Two, the Luger requires a cartridge's entire recoil impulse to operate properly. Allowing the hand and wrist to take up some of this recoil--"limp-wristing"--is a major reason for ejection failure. Considering that this pistol is an Aimco rather than the real deal, it could just as easily be a recoil spring tuning problem, but a firm shooting grip is something which is much easier to check and rectify for starters.
Its good to know that you have a good Luger guy nearby, they are worth their weight in gold. Good luck, and good shooting--let us know how it all works out.
--Dwight
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