The Shop is the main section of Blitz Brigade. It's the place to buy weapons divided over different divisions, vehicles and other items like consumables, taunts, greetings and kill signatures. Most of these items can be purchased there with the exception of instant re-spawn, automatic Training stage unlocks, puzzle unlocks etc. Both currencies can be used here. If a gun is unlocked, but not purchased, then it can only be bought throughout coins. Using diamonds as a substitute for coins is not recommended as they should be kept for buying guns that can only be purchased through diamonds or for making weapons premium. If a gun is not unlocked it can only be purchased with diamonds. (NOTE: Now it will just buy the weapon, and you can equip it right away) Also guns can be upgraded to premium with diamonds but it comes to an expensive price especially at higher levels. The more a weapon is used and obtain kills with it, the less the number of diamonds required to upgrade it to premium until it reaches the maximum of 3 stars. At this stage, it costs half the number of diamonds as opposed to upgrading a weapon that had never been used before.
Sgt. Gunn Edit
Sgt. Gunn is an allied soldier that could be seen selling guns at the Armory or in other pop-ups in 2014. The character is of course not a playable character or class in-game and can rarely appear in some notes or pop-ups.