Use this tactic to save rifle rounds when you are engaged in battle with the enemy. Find a safe place and turn your scanner on and zoom in around your location. When you have identified the location of the enemy leave the sight on them and and while still holding R2 switch to your Dual Blasters and fire at them.
If you near a door or hatch that you can slice through press triangle and when you are in the middle of slicing press down. The weapon indicator will not be there but when you are done slicing it will reappear press down again and the indicator will disappear again now if you press the fire button Jango's wrist will glow with a blue light. You can switch to a weapon even after you do this.
Ok listen to this I like starwars like you but I'm not shore on this 1 infinity ammo ^,down,<,down,down,<,down,down,<,down,down<,> This 1 works it's true invincibilety sorry about the spelling by the way press start and hold r2 + l2 ^,^,^,<,down,down,down,<,^,^,^,<,>
On the last level of chapter five 'favoure for a hut' when fighting the big Kryte Dragon thingy you should notice that the only weapons that can hurt the beast are the lasers and fists (you probabley didn't know about the fists bit, ha ha!). So when you fight the dragon at the beginning just go up to it and punch it to death(this is quite hard to do but somtimes the dragen just sits there like a dope).
Once you kill the dragon Jango goes to the end of the level. The only bad thing is that at the end you still don't have any guns.