Is there any way for me to make a sort of makeshift grenade launcher with alchemist bombs?

[Malik Gyan Daumantas]

and im talking like stick it in tube and let it fly sort of thing

[Firebug]

Well, there is the discovery Explosive Missile which makes your bomb range increment that of whatever ranged weapon you use to fire it. Normally this means targeting regular AC instead of Touch, but Dye arrows and Tangleshot arrows allow you to get back to touch AC-ish (-1 for tangleshot). It is a standard action that is not compatible with Fast Bombs discovery though.

Otherwise, Bomb Launchers increase the increment to 30', though may be restricted to Goblins and are expended when you use the bomb. Bombchucker increases the ranged increment of any thrown splash weapon (including bombs) by 10', though takes up one hand and requires the other hand to be free. While it seems weapon-like, it's actually a tool and can't be enchanted as a weapon.

[VoodistMonk]

Be a Dwarf Grenadier, and use a PelletBow to launch Bombs...

[avr]

Ranged weapons with the conductive weapon enhancement can add bombs to the damage. It's a little inefficient but takes no discovery or feat, or can even stack with explosive missile.

[Scott Wilhelm]

VoodistMonk wrote:

Be a Dwarf Grenadier, and use a PelletBow to launch Bombs...

Yes. Grenadier Alchemists have a Class Abilities to incorporate Alchemal Weapons like Acid into their arrows (or bullets, bolts, whatever) as a Move Action. This stacks with Explosive Missile, which allows you to load and shoot as a Standard Action.

[Scott Wilhelm]

There is a Pathfinder Crossbow made for this purpose, the Launching Crossbow. There is also the Flask Thrower. There is the Stormshaft Javelin.

Gnomes have a Alernate Racial Trait where they are automatically proficient in any weapon they themselves craft.

[JiCi]

You guys might want to be careful, because even though the Ranged Tactics Toolbox offered a lot of options of thrown weapons, MANY are NOT usable with the Alchemist Bombs.