Usually, I like to upgrade "Other" weapons that I will use for major upgrades:
This is just used as an example nothing more.
|Upgrade your favorite Rifle to +35
For this part you it really depends if you are just going all out , Or if your are specifically upgrading a weapon to its maximum allowable level. Which weapon exactly? Well that depends on your own preference.
So, for the sake of this example, Let's just say you happen to get a Sweet rare drop in one of your runs and you like the weapon so much that you want to get the most out of it.
Now obviously, this weapon type may or may not use Lambda Grinders, if it does , Then read my example just below this one.
|REGULAR GRINDERS FOR WEAPONS
Keep in mind that info on most weapons only say that that maximum level is +30, but - like it was mentioned before you can go past that.
To do so, YOU MUST add the SAME TYPE of weapon from the very start, Once you get to +30 you will have the option to go to +35
In this version you can still upgrade that weapon to +35 , Except - Now you need Lambda grinders.
In this case the upgrade are very very slow, but there is a way around this, especially IF you dont have a good stock of these grinders.
You will still need to "ADD" the same weapon type for the maximum upgrade, so just upgrade a Regular Grinder weapon to +20
and add it to your LAMBDA upgrade, it will allow you to upgrade much faster and still be able to get to +35
|Where to get more of the same Weapon in a Moments notice
Look into your inventory and if you have a Mass stock of Photon booster drops ( Most players do), you can exchange them for weapons that you need for upgrades on the 2 floor left side of the shopping district.
I hope that this will be of great help to you .