Weapon Mounts, What weapons are larger/smaller than a LMG Options

[Speeder]

Note: I'm new to the forums so go easy.

I'm currently making a Rigger, and these forums have answered almost all my questions. One question has eluded me since picking up the SR4 rulebook.

What is accually "larger" than a LMG? Obviously MMGs and HMGs would be larger, but where do grenade, rocket, and missile launchers fall?

Since no weights are given I do my normal and fall back on RL, given that even simi-auto grenade launchers are often smaller/light than LMGs.

Example: Milkor MGL (6 shot 40mm simi-automatic grenade luncher) = 11.68lb vs. M249 squad automatic weapon (LMG) = 17lb

Also, given that sholder fired rocket/ launchers can be lighter than LMGs.

Example: LRAC F1 (reusable rocket launcher) = 16.1lb vs. FN Minimi (LMG) = 18lb

Further complicating things is the fact that some "Heavy Sniper Rifles" like those that the Barret Model 121 from Arsenal is modeled after weigh much more than LMGs

Example: Barrett M82 (.50 caliber sniper rifle) = 30lb vs. M60 (1950s LMG) = 23.15lb

The cake topper for me is the fluff text from the Nimrod Aerial Combat Drone listing a Multi rocket launcher that does not even exist (unless you count the Gleche Hail Barrage Rocket Launcher from p103 "Main Guns")

Can anyone make any more sense out of this?

Signed
My head hurts