That's a strange combination. Dreadlocks didn't really appear in Rastafari movement until in 1950s, and even then quite slowly. In Hinduism, they are mostly reserved for holy men so you won't find many firearm wielders there. Unless someone is making extremely weird pulp minis, you can try:
1) Foundry street violence "yardies" packs. They have entirely modern gear and guns, though.
2) Micro Art conversion heads on your favourite minis.
That's the best I can suggest.