if your into modifying nerf guns and want them to be more powerful, i recommend using C02 canisters and you'll also have to modify the barrel a bit so that it can handle that point of instant pressure, (also from what i've heard C02 canisters are relatively cheap to buy as well but there basically a 1 time use) but this is also very dangerous if you are not able to create the right seal for the tube along with a safe release mechanism
Note: that this goes against Nerfs wishes to keep there products safe and fun but there's probably a person on YouTube who's already done it before you so
