Best paintball accessory kits according to redditors

Amazon has Dye ones on Prime. Could also get cheaper Evike ones but they may not arrive for the weekend.

Most airsoft or paintball stores will also have them.

You airsofters really go all out.

Wold they allow Simunition

or something like this? http://www.amazon.com/Action-Marker-Walther-RAM-slide/dp/B00169HBHO

Sight:
https://www.amazon.com/dp/B00U6R9RYM/ref=cm_sw_r_other_awd_85rxwbB4W659K

Mask:
Tippmann Paintball Intrepid Paintball Goggle Mask - Black & Olive https://www.amazon.com/dp/B00M07ZJZW/ref=cm_sw_r_other_awd_66rxwbBPHCAHA

The mask comes down a little farther than like speedball mask, but I love the damn thing.

> Propane or any similar gas would be unfeasible, it may not provide enough expansion fast enough

This won't be a problem, especially if you're working from compressed air. Though it might necessitate a bit of engineering for the injection nozzle design. In an enclosed space, the combustion is self-accelerating, since the pressure can't go anywhere, so you get adiabatic heating in addition to the heat of combustion. You might be limited to pistol-like velocities, but for a home defense, plinking, or small-game gun, that isn't bad.

> then there is the elephant in the room of lugging around a large pressurized tank of flammable gas

It wouldn't need to be large at all. A lot of people underestimate the energy contained in hydrocarbon fuels. The amount of energy in a disposable butane lighter is equivalent to that contained in 15 rounds of 556 (compared to the powder energy). It's more than 2 full 30-round mags if you compare it to the projectile kinetic energy. A propane tank 1" in diameter and 4" long would hold enough gas for 250 rounds with a kinetic energy equivalent to a 10mm auto (~20% chemical to kinetic energy conversion efficiency).

Now, the air tank would be a different story. Something relatively small like this could work in a carbine, but would only hold enough air to combust ~4 grams of fuel, which would be ~20 shots at 10mm energy levels. Fine for casual plinking or backwoods small game hunting, but you could easily go to a tank 2-3 times that size for something that needs to be refilled less often and could hold its own in a combat situation.

You can get a LOT more out of a smaller package by using nitrous oxide instead of compressed air, since compressed N2O can combust about 8 times as much fuel for a given storage tank volume as compressed air. Even one of those 8 gram whipped-cream nitrous chargers can combust enough fuel for ~5 rounds at 10mm power level. So if you instead go to a larger tank, such as a 12oz tank (they basically use the same tanks as compressed CO2), you now have 200+ shots in that. The tradeoff is that nitrous oxide is not cheap (you'd end up paying 20~40 cents per shot), and aside from those whipped cream chargers, it's not terribly available either.

> one API round in the right spot and you haven't just taken out the guy carrying the gun but also the people close to him.

As I pointed out above, with the tank sizes we're talking about, the risk of them being hit would not be very high. Furthermore, even API rounds have a hard time igniting propane when it comes out of those tanks, so the risk would not be unreasonable.

> from an engineering standpoint a liquid is also easier to deal with than a gas

Compressed gasses pump themselves, whereas liquids require pumping mechanisms. The other benefit to using compressed gasses (or gasses compressed into liquids, such as nitrous oxide or propane) is that you can use regenerative cooling, like they have for rocket engines. Imagine a gun like an LMG that never overheated, even after 1000+ rounds of continuous fire? No need for barrel changes or ammo belts, just a satchel with fuel/oxidizer and bullets that fed in from a hopper.

TBH, I should clarify that there are really 2 avenues that I'm looking at for this idea. One is as an actual upgrade to current firearms, while the other is as a DIY "Ludy" gun that doesn't require any suspicious components. Air and propane are readily available, and such a thing could be made to fire almost any type of arbitrary projectile, so you wouldn't need brass, smokeless powder, or primers.

Get yourself one of these! You'll be able to get that line as high as you want! ;)
Notch Set1027D Big Shot Throw Line Launcher Standard Kit, Black/Yellow https://www.amazon.com/dp/B075VYX31B/ref=cm_sw_r_cp_apa_i_AxfqDb5ABRM63

[Arborist slingshot] (https://www.amazon.com/Notch-Set1027D-Launcher-Standard-Yellow/dp/B075VYX31B/ref=sr_1_2?crid=4DZ9423GTBWO&keywords=arborist+slingshot+launcher&qid=1573443447&sprefix=Arborist+sli%2Caps%2C162&sr=8-2) What the pros use for getting line into tall trees. That is a slingshot. Check out Ham Radio CQ. He has used it for portable work. [Weighted Arborist Bag] (https://www.amazon.com/Thorium-Multi-layer-Slingshot-Launcher-Arborist/dp/B0721XC6VZ/ref=sr_1_13?crid=4DZ9423GTBWO&dchild=1&keywords=arborist+slingshot+launcher&qid=1573443479&sprefix=Arborist+sli%2Caps%2C162&sr=8-13) which is what is used in the slingshot and Arborist line box which is used for the line. The box folds down very small for easy portability while the line is in it. Arborists use very colorful line and bags so they can find them easily. My home trees are not that tall but it is very easy to loose the end of the string as I tend to use black paracord.