First, welcome to the forum and congratulations on having both a 1916 and 1921 Luger. One thing to think of, if your Lugers are collectible quality and you break a numbered part then you have just dropped value $500+ down to mismatched shooter value. On my matching number guns I will shoot them a few times but change out the original numbered pieces (extractor, firing pin and non-numbered original ejector since they are most likely to break) for less valuable spares.
For your mis-firing issue, you might try cleaning out the tunnel that the firing pin rides in and maybe replacing the firing pin spring with a fresh one made by Wolff gunsprings. I won't use steel cased ammo in my Lugers because of foreign made QC issues. WW white box works just fine as well as my lead bullet handloads.
Glad you are enjoying your Lugers. They are superb pistols and quite addictive.
Best
Charlie
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