there are many situations where a player would like to increase the projectile speed. in this case the player uses the explosive system 4, given that it boosts the projectile(munition) speed of all guns. the downside of this special is that it has some other improvements that are not needed.
so i would suggest to make a special that is purposely designed to improve the projectile speed.
as u can see in the image, the special increases the weapon weight by 25% what is very much.
for example there is the interception system which is used by some players to supercharge the launcher and increase a bit the combat speed but there is also the gauss supercharge which only supercharge the launcher.