You want to be a RANK 6 BERSERKER when you go to the trader for the first time sell your FIRE AXE and buy a KITANA and use it till WAVE 7 when the FLESHPOUNDS spawn.

(Wave 5 and 6 are simple since you have your Kitana when the Scrakes come out just hit them 4-5 times and they will go down)

When you go to the trader before WAVE 7 buy a FIRE AXE, but keep your KITANA for the trash such as CLOTS, GORFASTS, SIRENS, etc.

(Now if you don't want to lose so much armor then handcannon and shoot the crawlers before they get close enough to jump onto you.)

WAVE 7 is now starting what do you do? Well what I did is I search for the FLESHPOUND and take him out as soon as I can using the FIRE AXE aim for his head it might take 3-5 times before he dies but if you jump back before he hits you you will be just fine.

(Make sure when the Fleshpounds spawn you alt them with the Fire Axe which is the middle mouse button, then they will go down without any troubles!)

Keep all the stuff you have from the things you got from STEP 3 until the boss and make sure you have RANK 6 SUPPORT SPECIALIST, because this is going to help you out ALOT! When you go to the trader before the boss sell everything switch to your RANK 6 SUPPORT SPECIALIST and then buy the HUNTING SHOTGUN and the AA12 SHOTGUN.

Use the AA12 SHOTGUN on the boss and ONLY the boss! That's why you have the HUNTING SHOTGUN is so just in case he gets away to be able to heal you can kill the trash, but watch your back so he doesn't get you. Once again continue shooting him with the AA12 SHOTGUN till he dies, but when I use it he only gets away once to be able to heal and then shoot him like crazy and BAM! You have made it through the map!