HOW TO DROP THE RANK 9 ASSAULT RIFLE AR NINJA 3

AR Ninja 3 is considered one of the best Assault Rifle in the game together with Blue Rose MK3. 

In order to unlock this Boss and be able to farm this Rifle you first need to expand you home and clear Premiere's Request, here's a guide for your  Home Expansion and for Premiere's Request.

AR Ninja 3 is dropped by Makai Type XX in the Demon Cave so all you have to do is...gather a lot of patience and start your farming against this boring boss

I usually kill Makai Type XXX first (the blue one) since he gets too fast if he's the last one standing, but that's a matter of tastes I guess.

For a detailed walkthrough check the video below: