So here comes another mod from me. This mod will let you use two guns at a time. The mod is great and doesn't require CLEO. So just download it, extract it and move the "weapons.dat" file to:
/Android/data/com.rockstargames.gtasa/files/data/
Create a new data folder if it doesn't exist. :)
Hope you like mod, also visit my blog for more mods and tutorials. :)