You can farm the raptors in NORMAL mode with basically any primary, so long as your innovative and make good use of your secondary. I worked out and tested a d/w build for my derv primary this past weekend that can quickly and easily kill all the raptors in the cave except the boss, but can easily survive the boss long enough to pick up all the drops, and I'm not even that great at making builds, so it shouldn't be that hard.
If you are Rank 10 Asura and Dwarf, there is an Any/A build I've worked out that will kill all but the boss.
Two things I had issus with were staying in agro when they all died or surviving long enough to be alive when they all died. Have a play!