(adsbygoogle = window.adsbygoogle || []).push({}); im trying to get the perm PHD Flopper but can that be done with semtax or claymores?or just straight up frag grenades?If so than how the hell are you going to get enough ammo for 200 kills before wave 10?any tips?Also can you buy frag grenades anywhere in tranzit?

I got over 300-500 explosive kills (Grenades and claymores) on solo and I never got PhD Flopper. I always tested to see if I got it by shooting the ray gun right under myself. I'll try it again when I play with some of my friends

Your sig..

Can permanent perks (like steel barriers) be unlocked in solo? And also does the bank work in solo / can you store money in solo? (same goes for fridge)?

You can use the bank on Solo and your points stored in there can be used again if you decide to play solo or with your friends. Not sure about the permanent perks since I tried getting phd flopper and stammin up on solo (I did get deadshot daiquiri though). I followed all instructions for each perk and never got a green smoke to indicate that I got the permanent perk(s). I even constantly repaired barriers and never got steel barriers, and I played on up to round 36 on solo.

Maybe some people that have experience in modding/hacking cods can look in the code to see how you unlock those perks.