The only guns with Jones underlever I have encountered that was off-face was cheap Belgium guns. They also had a loose underlever. These guns however were cheap trade guns.

My 3 guns with Jones underlever respectivly from Rigby, H&H and Mantons are have all tight lock up.
I would state guns kept in good condition from the blackpowder era that keep shooting lead bullets and blackpowder(or light smokeless loads) will even today out last their new owners.