Tips for using the BIG GUNS (ie: Merr Sonn, Concussion Rifle):
Stock up on ammo before you go on the attack. Ie: pick up at least one ammo pack in addition to the gun itself.
With the Concussion rifle I like to stock up on Metallic bolts before I even whip it out to use, since it eats ammo so fast.
Tip: Metallic Bolt ammo is used by a number of other guns, so you can get more ammo by picking up a Repeater or Flechette (even if you have no plans to use them).
Guns are hungry, feed them!
When using the Merr Sonn, remember it's a SLOW NOISY GUN and the shots are pathetically easy to dodge or push back.
Some tips using it against Jedi:
Aim at surfaces nearby and just ahead of the direction they are moving in.
You know how you have to "lead" shots in lagged games or ones with lots of movement? Well "lead" a shot not at the person, but at the ground.
One thing I like to do with the Merr Sonn is to jump really high in the air with Force Jump and fire just as I'm almost on top of them, with the explosion landing at their feet.
With this method it's nearly impossible for them to push the rocket at you since you're firing at the last second (timing it properly so you don't fall into your own explosion of course) and almost impossible for them to pull your gun away since they'd have to be aiming directly up.
Repeat as necessary until they're a smoldering wreck.
Another trick some people like to use is to turn on Absorb... then nobody can pull your weapons away, as long as it's going.
Sometimes it helps to toss a little lightning in between gun bursts, to keep them off balance (works especially well if they're trying to stay alive using Protect). Just keep in mind that use of Lightning will cancel any "charged" weapon you're using and thus waste some ammo.
Homing Rockets: you have to be careful with these since they are easy to dodge and waste ammo.
Propbably the best time to use them is when you're chasing somebody on a straight-away or in an open area, or even better when the person is pre-occupied with something else (ie: saber fighting somebody).
They will usually see the Rocket coming but assume it's a regular rocket and only do a small dodge then ignore it... until it's too late!
The Concussion Rifle can be pushed if you line up your crosshair just right and push at the exact moment that the primary fire shot comes at them. However this is very hard to do and they won't have the force to do it every time.
Try to master accuracy with the secondary concussion as these shots throw bodies around, so you can use that to knock people off ledges or onto the ground for an easy one-two kill.
The Concussion shots hit so fast that they almost seem to come out of nowhere (not as good as the DEMP2 but still). Keep the pressure on and show no mercy, firing shot after shot until they go down.
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The DEMP2 is a great gun, because you can use the charged shot to stun people. It can even stop a saber user from swinging for a second or two! It has a slight "pushing" effect that can sometimes be used to nudge somebody off a ledge (but not as good as other explosive weapons).
Again, it's possible to push Primary shots away if you're good and quick, but you can fire so many more faster than they can ever push that they'll eventually go down. Still, I prefer to use the charged shot almost exclusively, since it's so stealthy and you can hit multiple people at once, while stunning them, even if the shots themselves are somewhat weak.
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The Disruptor seems like a crappy weapon on JA, but it's still VERY USEFUL. Since accuracy is more of a concern, you just have to get into a much better spot.
In JK2 you could switch to it in mid chase, and pop off a kill shot at almost point blank range. In JA you have to use it as a stealthy weapon pretty much unless you want to waste ammo taking pot shots with primary fire.
The JA BONUS MAP PACK maps are excellent for sniping! There are so many high places where you can hit a person's widest angle (and especially head shots) very easily (ie: their body is angled such that if you hit them, it's an almost guarenteed head shot or at least chest shot, rather than on a level plane where it could hit a limb and do very little damage or be easily dodged by Level 3 Seeing).
Ord Mantrell Canyon is a great map for sniping and there are several secret perches with respawning ammo you can find to use to your advantage. On CTF Rift of Shadows you can stand on those curved "claws" at each flag base for example.
These bonus maps are also nice because there are Concussion rifles to find! Rift of Shadows has TWO of them (one near each base), Ord Mantrell has one in a sniper area, Conquest of Byss has one, and Gas Mines has one.
Yes, and the throwable explosives (trip mines, td's, det packs) are SO MUCH FUN to use in JA (much moreso than JK2). This is due mostly to the accuracy, blast radius and speed with which you toss them.
And yes a general guns tip is to fire at a saberist's feet, just don't get caught crouching as they speed towards you with a Strong/Medium side swipe or Lunge!
For more gun strategies, check out my site:
http://strategy.jediknight.net/jka/weapons.shtml