Slug Rifle

"The workhorse of the Cabal field arsenal, this weapon's apparent simplicity belies the technology behind it. Each round is a microrocket capable of efficient operation in varying environmental and gravitational conditions. Standard-issue warheads mount a duplex explosive that combines an armor-piercing penetrator with a flesh-shredding shrapnel bus.

Cabal forces on Mars favor rockets with low velocity but high impact, perhaps due to their effectiveness against the Vex. In Guardian parlance, these weapons deal Solar damage."

References

http://db.destinytracker.com/grimoire/enemies/cabal-arsenal