Interarms Lugers are very well made versions of the Luger pistol. It's likely a maintenance or damage issue rather than design.
The Luger trigger linkage is fairly long, going through levers, a removable plate and a pivoting sear bar.
In what way is the trigger "stuck"? Is it a reset problem? is the trigger pull "gummy"?
Luger triggers will feel somewhat soft and imprecise as compared to the mechanism in other single action guns like the M1911a1.
It's likely that the mechanism needs cleaning, especially if lubrication was allowed to dry and get gummy.
The areas I would check are the spring well behind the trigger; the recess that the sear bar rotates within and the free operation of the little plunger on the front of the sear bar. You can use traditional cleaning methods for the exposed areas if they contain gum and dirt and soaking in solvent for the sear bar plunger.
Make sure to lubricate it with a good preserving gun oil.
If you're unfamiliar with the Luger mechanism, it would be best to consult a gunsmith with experience working on them (not just any gunsmith). This is an area that is finely fitted and balanced.
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