Face

Best low option. Easy to hit confirm into damage.

Rolls forward and shoots. Awkward at first, but very good range and very useful.
Can be faked by holding the P button. Can be useful for throw mixups and baiting Gatchis.
Has a somewhat low profile, so it can avoid certain attacks. Can roll under Cedric and Odile's projectiles clean. Profile remains low longer if the move is faked.
C version has more startup, but rolls farther and deal a lot more hitstun, so more combos are possible.
Can be canceled into Bazooka, or any other Gun Chain moves.

Rolls backward and then returns forward with a shot. Super useful poke, can be used for a lot of things, like baiting throws or attacks. Causes more hitstun that Frontier as well. Good for building meter too. C version is slower but causes even more hitstun.
Can be faked by holding the P button. Very useful for throw mixups.
Can be canceled into any other gun Chain move.

Can only be done from Frontier or Wild Return.
An overhead shot with very good range. Very fast but low damage. You can link a Bazooka off it with good timing. On some characters you can link a B Texas Knee off it on hit.

Can only be done from Frontier or Wild Return.
Very slow and rolls forward before attacking. Does a LOT of damage, but knocks down and is generally pretty useless.

Can only be done from Frontier or Wild Return.
A low shot with good range and speed. Seems to be fairly punishable on block. Can be canceled into Bazooka but that's it. Not exceedingly useful but nice to have every now and then.
D version is slower but knocks down.

Super fast, hits a big area. Can be comboed after. Can cross up on knocked down enemies. Is throw invincible on startup. Can be thrown on block though so don't spam it. One of Face's most important moves just because of the speed of it. Expect to be using this one a lot.

Slower and doesn't travel as far forward as the light version, but it's a much stronger finish. You should use this version only at the end of combos, when you can.

A fast projectile attack. It's completely invincible on startup and very fast. It's also pretty darn safe most of the time. However, it only has to be parried once so it's not good to use on a whim.
A version travels diagonally upwards, C version travels strait forward.

It usually does very low damage and can easily miss, but is relatively safe and you can use it to chip people to death in some situations. It damage scales better in combos as well, so many combos are actually stronger to finish with it than with the Bazooka.
B version travels a short distance and D version travels farther.

Shoots a strait forward shot at head level. Good for catching out of the air at a distance or in juggles. Cancels to any other shot or to Super.

Shoots a strait forward shot at foot level. Hits low. Very good surprise attack and combo starter. Cancels to any other shot or to Super.

Shoots a shot diagonally upward. Does the most damage of any shot. Cancels to Mid or Low shots, or to Super.

Does a short jump and shoots diagonally downward. Hits High. Somewhat slow so easy to block on reaction, but can be a very good surprise attack, and can be used to leap over fireballs and other things. Doesn't cancel into anything, but juggles the highest so is the easiest to follow up on.

High > Mid > Over > Low

New low chain in Heat Up. Can chain into gun shot combos. Becomes your ideal 'low' starter because 5D allows them to tech quickly.

Another new chain in Heat Up.

Only works in the corner, or anywhere on Freed.

Reset, mixup as they come down.

Difficult to connect, only works on some characters or in certain situations.

Tight link off overhead shot into Bazooka. Tricky, but very useful and easy to hit confirm. May miss if distance is too large.

Not really hit confirmable so not that useful.

Gives access to same combos as 214C and 236C

Very slightly more damage but a little harder to do. Use it to put them behind you instead of in front of you.

Won't work deep in the corner on some characters.

May work anywhere on some characters (Deathbringer)

Won't work deep in the corner on some characters.

Gets you out of the corner and them into it.