Here are some general guidelines for how to handle weapons. The first thing you need to do is find a mech around the same weight of your mech then check the weight and make sure it is in the same class as the mech your making (ex: if your making a light mech make sure the mech is in the light mech range) once you've found a mech with the weapons you want and the class your in then get with the DM and figure the weight of the weapon and price here are some general guidelines and weight for those weapons. I am going to list thing by chassis here. The prices I have listed here are for instillation also, not just the weapon system alone.

I will try to explain how to add a weapon system from a larger mech chassis than the one you bought for yourself. What I have figured is look at the chassis you bought and then look at the weight of the mech with the weapon you want figure the general chassis size of that mech now count the # of sizes difference (so if you bought a light mech and want to put a heavy mech weapon on it the would be a 2 size difference) then you add that # to the base of 1 for your mech size putting on a weapon for your chassis, that will give you the weapon slots for that particular weapon to be added to a mech of a different chassis size (so you add the base chassis weapon slot of 1 to the difference of 2 chassis sizes for the weapon you want and the slots for that weapon is 3 slots).

Light:I am trying to give a good system here if you have any suggestions email me and I'll look at them and see if I can use it in this section.
 

Type of Wpn	Weight (Tons)	Cost (Million)	General Info
Laser	.5 - 2	1 - 5	The less damage a weapon does the lower the weight and cost
Ballistic	1 - 3	.25 - 2	Machineguns(lower cost & weight)& Railguns(higher cost & weight)
Missle	.25- 3	2 - 7	Grenades(lower cost &weight)&Missles(depends on damge generally higher weight & cost)
Vibro Wpns	.25 - 2	2 - 7	Same as Laser systems
Other Energy	1 - 3	4 - 10	Ion & Plasma Wpns (the higher the damage the higher the weight & cost)

Medium:
 

Type of Wpn	Weight(Tons)	Cost(Million)	General Info
Laser	1 - 4	3 - 7	Same as the categorie above(light)
Ballistic	3 - 5	1 - 3	Same as the categorie above(light)
Missle	2 - 6	4 - 9	Same as the categorie above(light)
Vibro	2 - 4	4 - 9	Same as the categorie above(light)
Other Energy	3 - 6	7 - 13	Same as the categorie above(light)

Weapons page #2.

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