I can make one in my garage in about a half hour.

I'm not entirely sure you're grasping the concept; the game will take place some 250+ years removed from any production of such firearms, with an interceding nuclear holocaust. Just because you claim you can make one in your garage doesn't mean someone in the year 2280 will be able to.

ok lets review, 270 years from now, and 200 years after said nuclear holocaust people will be . . .
Maintaining Hover Dam
Mantinaing dozens if not hundreds of Nice shiny perfecttly functional Robots
not to mention literaly miles of multi colored neon lights.

Being able to build or maintain firearms is fairly trivilal compared to that given that theres entire citys in Pacistan right now that bairly have electricity but are able to turn out replicas of virtualy every modern firearm known to man.

I'm entirely sure you're not grasping what I'm telling you. It takes no great amount of skill or resources to make an effective surpressor, today, tomorrow, after holocausts or on the moon. Making one is illegal. Saying you've made one is probably not illegal, but certainly not smart. So you'll have to settle for I know I could if I wanted to. Without any special resources.

I doubt Vegas has the ability to manufacture firearms in a post-war enviroment due to:

1. Loss of people who know how to build the firearms

2. Destruction to factories (ect.) where the firearms are built due to rioting (ect.)

3. Equipment being worn-down

4. Lack of resources

Unless they could replace the equipment needed to build firearms, the expertise, and the structures that housed the equipment in the first place (along with the resources necessary), then Vegas probably won't be able to produce actual firearms.

So, just because you can, everybody can?

Not entirely sure that logic holds up to...well, anything.

It's a threaded tube with chambers in it. That simple. The first effective suppressors were made at the beginning of the 1900s. I'm pretty sure guys that can repair energy weapons and robots would have no problem making threaded tubes.

The train of logic would be more like this: If you can make an effective surpressor with minimal resources and moderate skill today, then it follows that 200 years from now you could still make an effective surpressor with minimal resoureces and moderate skill. Certainly someone would possess the modest skill required. You don't have to be a master gunsmith or have a shop filled with computer operated lathes. It defies logic that everybody could. Of course that has nothing to do with whether someone can.

And something some random guy threw together in his garage constitutes the "good stuff" in question?

Then, pray tell, how would you define the "bad stuff"?

This is getting old. To summarize, the "good stuff", meaning integral wet surpressors and the like do take quite a bit or resources and skill to make, but can quite effectively reduce audible levels of firearms to lower than ambient background noise. It is also possible to make effective surpressors with much more modest resources that can be almost as effective, given the right firearm/ammo load. You can take that as you wish, or not. All I know is I'm working from a base of knowledge. I have no idea if anyone else in this conversation is, or has just read a few thing on wikipedia. So, it was nice conversing with you all. Have a nice night.

Silencer is the term used by the inventor of the device, Hiram Percy Maxim. It is the term still used in industrial applications. It is the term used in the UK for automotive applications. It is the term used by half of the manufacturers for gun silencers (just go to the advanced-armament website if you don't believe me). And finally silencer is the legal term that shows up on the tax stamp paperwork in the US. The ATF form 4 says "(7) a muffler or silencer for any firearm whether or not such firearm is included within this definition;". Silencer, suppressor, or muffler are all acceptable terms.

Silencers don't reduce a bullet's velocity. They even out the impulse created by burning the powder. Silencers actually increase velocity because they act a little like a longer barrel. Until the bullet comes out of the end of the silencer it is still being pushed by the gas created by the burning powder.

Sure silencers aren't hollywood quiet, but they are nailgun quiet or even paintball gun quiet. The Decibel scale is logrithmic. A silencer that cuts the report of a gunshot by 30db is making it 1000 times quieter. While that can still be quite loud it is closer to silent than to the unsuppressed gun. 1/1000 is closer to 0 than 1.

If we were to suffer a fallout-esque end of the world event silencers would become very common because they are simple to build and without laws discouraging putting a muffler on a gun saving one's hearing is worth the weight penalty.