Need advice designing a fair ultra tech gun.

[GodBeastX]

Realistically (Gaming realistically perhaps):

30 DR is a lot for most ballistics. And if you are looking to use a ballistic medium then you're probably going to watch most objects bounce right off. Take a Gyroc, 6d is 21 average so it's not really something to fear.

I would have probably looked at Gauss before a Gyroc. Considering the Gauss "Needles" are more like spikes.

Either way it's not ideal to use a needle or spike for an explosive, I imagine.

Cinematically (My favorite):

Of course you can make explosive needles. You can pretty much give them whatever stats you want and handwaive it with pseudo science explanations.

First thought in my mind when you spoke about not exploding right away was C4. Do I know how C4 works? Nope, but I saw movies where you can smash it, run it over, put it in your mouth and chew, but it won't explode until it gets an electric charge! And that sorta psuedo reality is exactly what Cinematic is about.

So just say it has a radio detonator in the gun tied to the spikes fired from the weapon. That way other radio guns can't blow them up. They're made of a super hard explosive polymer that when ignition is triggered, BOOM!

Give them a PI damage type based on side, a dice damage based on velocity (Which will probably affect range), armor penetration based on hardness, and you got your deadly spiked bombs!

Mathematically 30 DR with (2) penetration probably needs around 4d6 to 5d6 to make a weapon scary for armor pen. Explosions you can make up whatever, it's psuedo science. Just pick numbers. Maybe do a formula based on how many hits were sustained from the needles. Could use something based on shotgun damages. Of course, blow through might be a problem with a piercing weapon. So if damage > what a body part can sustain, the needle didn't stick in, it went right through!