Hondo44
Hawkeye
Time to look deeper.
Your cyl latch is not coming up high enough to lock in the notches. Most likely a factor of a bent hammer plunger which doesn't retract far enough back in its hole and is keeping the cyl latch from rising to its full height.
If the plunger is bent it will be obvious. If it's not bent install a new cyl latch, these seldom need fitting.
Some former owner may have tried to "smooth" the action but didn't know how to do it properly.
Your cyl latch is not coming up high enough to lock in the notches. Most likely a factor of a bent hammer plunger which doesn't retract far enough back in its hole and is keeping the cyl latch from rising to its full height.
If the plunger is bent it will be obvious. If it's not bent install a new cyl latch, these seldom need fitting.
Some former owner may have tried to "smooth" the action but didn't know how to do it properly.