Quick & easy bolts - Ratchet: Deadlocked
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In the battledome, play "swarmer soccer". When choosing your weapons select the following three for your main weapons (note:this only applies if you have the 3)
1. Machine gun turrets - with shock mod
2. Dual vipers - with shock
3. Harbinger - mod of your choice
Just keep putting out the turrets and just run around to collect everything. You shouldn't even need to a fire any other gun.
If you don't have the harbinger, then either use magma cannon or either of the mine launchers.