There’s no need for money to unlock the double guns in Mini Militia. This guide will tell you how to unlock the double gun for free.
The two most popular guns for doubles are Magnum and UZI. Head to your armory and click on the double guns icon just next to Magnum. You will find the double gun will unlock at level 10.
Move to the SMGs tab and click the double guns icon next to UZI. This double gun will also unlock at level 10.
You will need to open up the crates to increase the level of different guns. The crate in the following image provides the option to upgrade UZI.
Head back to SMGs in the Armory and click on upgrade to increase the level of UZI.
Once it reaches level 10, the double gun will be unlocked.