i have a quick question how can i get hamers assault magazine its looks really good and want to use as a f2p player.

hey guys i am warrent officer 3 rn and have 55k. crystals ready to upgrade . i have a MK3-3 firebird MK3-7 freeze and a MK3-7 railgun(these are the turrets i wana play main)i am confused which to upgrade to get to higher level and which is bette in the higher ranks. I would also like a suggestion on which is the better hull hornet or viking with the following turret. ty in advance :).