One of the reasons that Idaho is/was dropping the hammer (so-to-speak) on inlines they have been told that inline lock time is far superior to sidelocks.

Definition
Lock-time is the time between the trigger break and primer ignition.

It is my belief that TC has improved lock time on the sidelock to be equal to a lot of plunger type inlines.... The newer TC locks do not have the length of throw that some of the older ones have.

Here is an exploded view of the basic lock...


The part in the lock that I believe makes the difference is the #54 the tumbler... I have replaced one tumbler from a parts order into an older lock and it made a huge difference in the length of throw.

Example, here is a pic of the difference the lock on top is the lock I would call a fast lock while the bottom lock is the typical TC lock - long throw - long lock time....

The top picture shows both guns @ 1/2 cock and the bottom picture shows fully drawn.... There certainly is a difference in length of travel by both hammers... which I think equates to a quicker lock time.