For people that didn’t understand you have to download MasterCraft for iOS and then find the gun mod shown in the video after you’ve done all the steps go to your Xbox join the same map and type the command
/give @a gun:ak47
there’s more than one gun and to reload do this command
/give @a ammo:rifle 64
Then go to your crafting table and craft the ammo and gun together you can’t do this command on Xbox only on iOS
That is not the only map you can use you can use more but on iOS you have to download an app mcpedl will not work anymore if you need more help contact me on my Twitter here:   / f4t4rec  

Full list of commands:

/give @p gun:scar
/give @p gun:s686
/give @p gun:kar98k
/give @p gun:taser
/give @p gun:aug
/give @p gun:m16a4
/give @p gun:m1897
/give @p gun:awm
/give @p gun:ak47
/give @p gun:uzi
/give @p gun:m249
/give @p gun:deagle
/give @p gun:laser
/give @p gun:bat
/give @p gun:dsword
/give @p gun:bubble
/give @p gun:flame
/give @p gun:p90
/give @p bomb:rpg
/give @p bomb:coin
/give @p bomb:pumpkin
/give @p bomb:moon_cake
/give @p bomb:peace
/give @p xm:parachute
/give @p ammo:smg 64
/give @p ammo:rpg 64
/give @p ammo:machine 64
/give @p ammo:shotgun 64
/give @p ammo:rifle 64
/give @p ammo:pistol 64
/give @p ammo:sniper 64