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how many pounds of force do i want. i dont think that i would need that much, since all its doing is pushing a 4.5mm metal bb. also, do i want to get a nose mount of a pivot mount air cylinder

You'll also have to consider the forces of friction that may occur when making any seals it will need. This will depend on whatever your design is.

Does anyone know where to find an air cylinder who's rod is no more than 4.5 mm (.177 inches)

Yep. On that link I sent you.

Look at the 5/32" bore ones. There are two options in there: 1/4" or 1/2" stroke length.

The only problem is that you'll need to find a little hose and connectors to get pressure to the cylinder. McMaster should have them, but I know little about small lines.

Anyone with any experience with the spool type manual DCVs: is I used one as my main valve, would my shots vary slot depending on how hard I can push the trigger, or should it be fairly consistent?

P.S.
I plan on using a 1/4" manual push button spool valve to fire .177 pellets

Does anyone know where to find an air cylinder who's rod is no more than 4.5 mm (.177 inches)

if you can't find one you can attach a 4.5 mm rod to the rod of cylinder

I am not in the mood for spoonfeeding you know ->
check pages 7-12 and 83
http://clippard.com/downloads/general/P ... inders.pdf

im trying to make a semi auto gun, with a portable air tank that will hold a lot of pressure. i dont want all of the pressure from the air tank feeding into the chamber right after i hook it up. i want to be able to control every shot and have consistent power (like 50 psi every shot). i was thinking about getting a two gauge air regulator, is this a good idea or is there a better way to do this

sure it will work - you just need a regulator

Dude, Palanit, I don't mean to sound impolite, but maybe you should start with something a little more simple until you learn some basics.

I already have. I have built pneumatic cannons with ball valves, sprinkler valves, and piston valves. This is what I want to do next. I have just never used air cylinders or qevs. I also just don't want to buy the wrong partaking and waste money. That is why I am asking you guys questions and I appreciate the help. I have one final question. I was previously going to use propane as a portable source. However I am learning that propane may not be that good of a source. I'm either going to use propane or co2, which do you guys think will be better. I want to be able to get a lot of shots per tank

I just made a new topic http://www.spudfiles.com/forums/viewtop ... tml#353853. You guys have been a great help to me so far and would truly appreciate it if you guys continued to do so.
Thanks

very,useful info for a beginner such as myself.The links are great as well.Thankyou.(you won't believe this but as i was reading,my fridge comp started to die)another mission.Thanks for the help.