diff --git a/data/json/items/gun/shot.json b/data/json/items/gun/shot.json
index a0c1f6dde9f75..662fbbcbf64b9 100644
--- a/data/json/items/gun/shot.json
+++ b/data/json/items/gun/shot.json
@@ -53,7 +53,7 @@
     "material": [ "steel" ],
     "dispersion": 855,
     "durability": 8,
-    "burst": 6,
+    "modes": [ [ "DEFAULT", "burst", 6 ] ],
     "ups_charges": 1,
     "reload": 200,
     "valid_mod_locations": [ [ "accessories", 4 ], [ "sights", 1 ], [ "rail mount", 1 ] ],
diff --git a/doc/JSON_INFO.md b/doc/JSON_INFO.md
index ea1e15b2fde8d..decfedccd4ab4 100644
--- a/doc/JSON_INFO.md
+++ b/doc/JSON_INFO.md
@@ -2686,7 +2686,6 @@ Guns can be defined like this:
 "durability": 8,           // Resistance to damage/rusting, also determines misfire chance
 "blackpowder_tolerance": 8,// One in X chance to get clogged up (per shot) when firing blackpowder ammunition (higher is better). Optional, default is 8.
 "min_cycle_recoil": 0,     // Minimum ammo recoil for gun to be able to fire more than once per attack.
-"burst": 5,                // Number of shots fired in burst mode
 "variants": [              // Cosmetic variants this gun can have
   {
     "id": "varianta",                           // id used in spawning to spawn this variant specifically
@@ -2699,6 +2698,7 @@ Guns can be defined like this:
 "clip_size": 100,          // Maximum amount of ammo that can be loaded
 "ups_charges": 0,          // Additionally to the normal ammo (if any), a gun can require some charges from an UPS. This also works on mods. Attaching a mod with ups_charges will add/increase ups drain on the weapon.
 "ammo_to_fire" 1,          // Amount of ammo used
+"modes": [ [ "DEFAULT", "semi-auto", 1 ], [ "AUTO", "auto", 4 ] ], // Firing modes on this gun, DEFAULT,AUTO, or MELEE followed by the name of the mode displayed in game, and finaly the number of shots of the mod.
 "reload": 450,             // Amount of time to reload, 100 = 1 second = 1 "turn"
 "built_in_mods": ["m203"], //An array of mods that will be integrated in the weapon using the IRREMOVABLE tag.
 "default_mods": ["m203"]   //An array of mods that will be added to a weapon on spawn.
@@ -2731,7 +2731,6 @@ Gun mods can be defined like this:
 "acceptable_ammo": [ "9mm" ],  // Optional filter restricting mod to guns with those base (before modifiers) ammo types
 "ammo_modifier": [ "57" ],     // Optional field which if specified modifies parent gun to use these ammo types
 "magazine_adaptor": [ [ "223", [ "stanag30" ] ] ], // Optional field which changes the types of magazines the parent gun accepts
-"burst_modifier": 3,           // Optional field increasing or decreasing base gun burst size
 "damage_modifier": -1,         // Optional field increasing or decreasing base gun damage
 "dispersion_modifier": 15,     // Optional field increasing or decreasing base gun dispersion
 "loudness_modifier": 4,        // Optional field increasing or decreasing base guns loudness
diff --git a/src/item_factory.cpp b/src/item_factory.cpp
index c7f736d1e3eef..dd7ecebfc358a 100644
--- a/src/item_factory.cpp
+++ b/src/item_factory.cpp
@@ -418,12 +418,6 @@ void Item_factory::finalize_pre( itype &obj )
                                     gun_modifier_data( to_translation( "melee" ), 1,
             { "MELEE" } ) );
         }
-        if( obj.gun->burst > 1 ) {
-            // handle legacy JSON format
-            obj.gun->modes.emplace( gun_mode_id( "AUTO" ),
-                                    gun_modifier_data( to_translation( "auto" ), obj.gun->burst,
-                                            std::set<std::string>() ) );
-        }
 
         if( obj.gun->handling < 0 ) {
             // TODO: specify in JSON via classes
@@ -1795,11 +1789,6 @@ void gun_variant_data::load( const JsonObject &jo )
 void Item_factory::load( islot_gun &slot, const JsonObject &jo, const std::string &src )
 {
     bool strict = src == "dda";
-
-    if( jo.has_member( "burst" ) && jo.has_member( "modes" ) ) {
-        jo.throw_error( "cannot specify both burst and modes", "burst" );
-    }
-
     assign( jo, "skill", slot.skill_used, strict );
     assign( jo, "ammo", slot.ammo, strict );
     assign( jo, "range", slot.range, strict );
@@ -1811,7 +1800,6 @@ void Item_factory::load( islot_gun &slot, const JsonObject &jo, const std::strin
     assign( jo, "recoil", slot.recoil, strict, 0 );
     assign( jo, "handling", slot.handling, strict );
     assign( jo, "durability", slot.durability, strict, 0, 10 );
-    assign( jo, "burst", slot.burst, strict, 1 );
     assign( jo, "loudness", slot.loudness, strict );
     assign( jo, "clip_size", slot.clip, strict, 0 );
     assign( jo, "reload", slot.reload_time, strict, 0 );
diff --git a/src/itype.h b/src/itype.h
index 05c6de659d557..35c5f3e1ba2c1 100644
--- a/src/itype.h
+++ b/src/itype.h
@@ -546,9 +546,6 @@ struct islot_gun : common_ranged_data {
     /** Firing modes are supported by the gun. Always contains at least DEFAULT mode */
     std::map<gun_mode_id, gun_modifier_data> modes;
 
-    /** Burst size for AUTO mode (legacy field for items not migrated to specify modes ) */
-    int burst = 0;
-
     /** How easy is control of recoil? If unset value automatically derived from weapon type */
     int handling = -1;