As I'm sure most of you already know, Gunner Lions/Foxes don't do critical hits based on a random chance factor, but based on a mechanic generally called timed crits; for newer players not in the know, here is a good video tutorial on timed crits/double shots/double crits (the latter two of which I've never succeeded in doing myself, though).
Now, what the video fails to mention, is that the delay for timed crits isn't always the same. Depending on the gun one employs, the delay with which you need to shoot the next ammo to get a critical hit varies.
From what I've seen, lower leveled guns tend to have higher delays, ranging from like roughly a second after the damage icon disappears to a split second after it disappears. However, the higher leveled the gun becomes, the more I find it hard to understand the timing I need to get the timed crits, which mean a lot to a solo hit-and-run PvE gunner: it's often the difference between a 3HKO and a 2HKO; saving ammos and dishing out more damage is always good, especially for a job with low defensive stats.
And thus, we get to the point of this thread: does anybody know if there's a list of exact delays you need to get timed crits with the various guns?