diff --git a/src/main/kotlin/com/dowstats/data/dto/controllers/ResearchEffectDto.kt b/src/main/kotlin/com/dowstats/data/dto/controllers/ResearchEffectDto.kt
new file mode 100644
index 0000000..b79f641
--- /dev/null
+++ b/src/main/kotlin/com/dowstats/data/dto/controllers/ResearchEffectDto.kt
@@ -0,0 +1,11 @@
+package com.dowstats.data.dto.controllers
+
+/**
+ * Описывает как исследование влияет на конкретное поле оружия
+ * (урон, точность, перезарядка и т.д.).
+ */
+data class ResearchEffectDto(
+    val field: String,
+    val usageType: String?,
+    val modifierValue: Double?,
+)
diff --git a/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponDto.kt b/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponDto.kt
index 6015991..469ada8 100644
--- a/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponDto.kt
+++ b/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponDto.kt
@@ -36,4 +36,5 @@ data class WeaponDto(
     val modifiers: List<ModifierDto>,
     val requirements: RequirementDto?,
     val hotkey: String?,
+    val researches: List<WeaponResearchDto>,
 )
diff --git a/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponResearchDto.kt b/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponResearchDto.kt
new file mode 100644
index 0000000..4b6a27d
--- /dev/null
+++ b/src/main/kotlin/com/dowstats/data/dto/controllers/WeaponResearchDto.kt
@@ -0,0 +1,13 @@
+package com.dowstats.data.dto.controllers
+
+import com.dowstats.data.dto.controllers.research.ResearchShortDto
+
+/**
+ * Описывает влияние конкретного исследования (research) на оружие:
+ * список эффектов по полям оружия (урон, точность, перезарядка и т.д.).
+ */
+data class WeaponResearchDto(
+    val research: ResearchShortDto,
+    val researchRequired: List<ResearchShortDto> = emptyList(),
+    val effects: List<ResearchEffectDto>,
+)
diff --git a/src/main/kotlin/com/dowstats/data/entities/weapon/Weapon.kt b/src/main/kotlin/com/dowstats/data/entities/weapon/Weapon.kt
index 794c030..884f7bb 100644
--- a/src/main/kotlin/com/dowstats/data/entities/weapon/Weapon.kt
+++ b/src/main/kotlin/com/dowstats/data/entities/weapon/Weapon.kt
@@ -2,6 +2,7 @@ package com.dowstats.data.entities.weapon
 
 import com.dowstats.data.dto.controllers.RequirementDto
 import com.dowstats.data.dto.controllers.WeaponDto
+import com.dowstats.data.dto.controllers.WeaponResearchDto
 import com.dowstats.data.dto.controllers.WeaponShortDto
 import com.dowstats.data.entities.ability.Ability
 import com.dowstats.data.entities.sergant.SergeantWeapon
@@ -107,7 +108,7 @@ class Weapon {
     @OneToMany(mappedBy="weapon", cascade = [(CascadeType.ALL)])
     var weaponPiercings: List<WeaponArmorPiercing> = listOf()
 
-    fun toDto(requirementDto: RequirementDto?) = WeaponDto(
+    fun toDto(requirementDto: RequirementDto?, researches: List<WeaponResearchDto>) = WeaponDto(
         id!!,
         filename!!,
         name,
@@ -140,6 +141,7 @@ class Weapon {
         weaponModifiers.map { mod -> mod.toDto().copy(maxLifeTime = mod.maxLifeTime) },
         requirementDto,
         uiHotkeyName,
+        researches,
     )
 
     fun toShortDto() = WeaponShortDto(
diff --git a/src/main/kotlin/com/dowstats/service/datamaps/WeaponResearchEffectMappingComponent.kt b/src/main/kotlin/com/dowstats/service/datamaps/WeaponResearchEffectMappingComponent.kt
new file mode 100644
index 0000000..1ad0b98
--- /dev/null
+++ b/src/main/kotlin/com/dowstats/service/datamaps/WeaponResearchEffectMappingComponent.kt
@@ -0,0 +1,117 @@
+package com.dowstats.service.datamaps
+
+import com.dowstats.Metadata.Requirements
+import com.dowstats.data.dto.controllers.ResearchEffectDto
+import com.dowstats.data.dto.controllers.WeaponResearchDto
+import com.dowstats.data.dto.controllers.research.ResearchShortDto
+import com.dowstats.data.entities.research.Research
+import com.dowstats.data.entities.weapon.Weapon
+import com.dowstats.data.repositories.ResearchRepository
+import org.springframework.stereotype.Component
+
+/**
+ * Builds detailed information about how researches affect a weapon's fields.
+ * Maps research modifier references to weapon fields.
+ */
+@Component
+class WeaponResearchEffectMappingComponent(
+    val researchRepository: ResearchRepository,
+) {
+
+    /**
+     * Mapping from modifier reference name (without modifiers prefix and .lua suffix)
+     * to the corresponding weapon field name.
+     */
+    private val referenceToField: Map<String, String> = mapOf(
+        "accuracy_moving_reduction_weapon_modifier" to "accuracyReductionMoving",
+        "accuracy_ranged_weapon_modifier" to "accuracy",
+        "accuracy_weapon_modifier" to "accuracy",
+        "armour_piercing_weapon_modifier" to "armourPiercing",
+        "max_damage_weapon_modifier" to "maxDamage",
+        "max_range_weapon_modifier" to "maxRange",
+        "min_damage_weapon_modifier" to "minDamage",
+        "reload_time_weapon_modifier" to "reloadTime",
+        "setup_time_weapon_modifier" to "setupTime",
+    )
+
+    /**
+     * Builds a list of WeaponResearchDto for a given weapon,
+     * describing how each affecting research modifies the weapon's fields.
+     */
+    fun buildEffects(weapon: Weapon): List<WeaponResearchDto> {
+        val weaponTarget = weapon.filename?.replace(".rgd", "") ?: return emptyList()
+
+        return weapon.affectedResearches.mapNotNull { research ->
+            val effects = research.researchModifiers
+                .filter { modifier ->
+                    modifier.target == weaponTarget && modifier.reference != null
+                }
+                .mapNotNull { modifier ->
+                    val refName = extractRefName(modifier.reference!!)
+                    val field = referenceToField[refName] ?: return@mapNotNull null
+
+                    ResearchEffectDto(
+                        field = field,
+                        usageType = modifier.usageType,
+                        modifierValue = modifier.value,
+                    )
+                }
+
+            if (effects.isEmpty()) return@mapNotNull null
+
+            WeaponResearchDto(
+                research = research.toResearchShortDto(),
+                researchRequired = getRequiredResearches(research),
+                effects = effects,
+            )
+        }
+    }
+
+    /**
+     * Returns researches required by the given research (its prerequisites).
+     * Handles both "required_research" (excluding "must not be complete" ones,
+     * since they are mutually exclusive rather than required)
+     * and "required_research_either" requirements.
+     */
+    private fun getRequiredResearches(research: Research): List<ResearchShortDto> {
+        val modId = research.modId ?: return emptyList()
+
+        val required = research.researchRequirements
+            .filter { it.reference?.getPureReference() == Requirements.REFERENCE_REQUIREMENT_RESEARCH }
+            .filter { it.value?.split(";")?.last() != "true" }
+            .mapNotNull { req ->
+                req.value?.split(";")?.first()
+                    ?.replace(".lua", ".rgd")
+                    ?.replace("research\\", "")
+                    ?.let { if (it.endsWith(".rgd")) it else "$it.rgd" }
+                    ?.let { researchRepository.findFirstByModIdAndFilename(modId, it)?.toResearchShortDto() }
+            }
+
+        val requiredEither = research.researchRequirements
+            .filter { it.reference?.getPureReference() == Requirements.REFERENCE_REQUIRED_RESEARCH_EITHER }
+            .flatMap { req ->
+                req.value?.split(";").orEmpty().mapNotNull { r ->
+                    val researchFileName = r.split("\\").last().replace(".lua", ".rgd").let { resFile ->
+                        if (resFile.endsWith(".rgd")) resFile else "$resFile.rgd"
+                    }
+                    researchRepository.findFirstByModIdAndFilename(modId, researchFileName)?.toResearchShortDto()
+                }
+            }
+
+        return (required + requiredEither).distinct()
+    }
+
+    private fun String.getPureReference(): String =
+        this.split("\\").last()
+            .replace(".lua", "")
+            .replace(".rgd", "")
+
+    /**
+     * Extracts the short modifier name from a full reference path.
+     * e.g. modifiers/max_damage_weapon_modifier.lua -> max_damage_weapon_modifier
+     */
+    private fun extractRefName(reference: String): String =
+        reference.split("\\").first()
+            .replace(".lua", "")
+            .replace(".rgd", "")
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/dowstats/service/datamaps/WeaponService.kt b/src/main/kotlin/com/dowstats/service/datamaps/WeaponService.kt
index 284be33..cf60e7d 100644
--- a/src/main/kotlin/com/dowstats/service/datamaps/WeaponService.kt
+++ b/src/main/kotlin/com/dowstats/service/datamaps/WeaponService.kt
@@ -9,6 +9,7 @@ import org.springframework.stereotype.Service
 class WeaponService @Autowired constructor(
     val weaponRepository: WeaponRepository,
     val requirementsMappingComponent: RequirementsMappingComponent,
+    val weaponResearchEffectMappingComponent: WeaponResearchEffectMappingComponent,
 ) {
 
     fun getWeaponDto(id: Long, modId: Long): WeaponDto {
@@ -16,7 +17,8 @@ class WeaponService @Autowired constructor(
         val requirements = requirementsMappingComponent
             .getRequirements(weapon.weaponRequirements.toList(),
                 modId)
-        return weapon.toDto(requirements)
+        val researches = weaponResearchEffectMappingComponent.buildEffects(weapon)
+        return weapon.toDto(requirements, researches)
     }
 
 
diff --git a/src/main/resources/db/0.0.6/schema/add_index_to_researches.json b/src/main/resources/db/0.0.6/schema/add_index_to_researches.json
new file mode 100644
index 0000000..c3ec569
--- /dev/null
+++ b/src/main/resources/db/0.0.6/schema/add_index_to_researches.json
@@ -0,0 +1,30 @@
+{
+  "databaseChangeLog": [
+    {
+      "changeSet": {
+        "id": "Add index on mod_id and filename to researches",
+        "author": "anibus",
+        "changes": [
+          {
+            "createIndex": {
+              "indexName": "idx_researches_mod_id_filename",
+              "tableName": "researches",
+              "columns": [
+                {
+                  "column": {
+                    "name": "mod_id"
+                  }
+                },
+                {
+                  "column": {
+                    "name": "filename"
+                  }
+                }
+              ]
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/src/main/resources/db/changelog-master.json b/src/main/resources/db/changelog-master.json
index e285261..05b535e 100644
--- a/src/main/resources/db/changelog-master.json
+++ b/src/main/resources/db/changelog-master.json
@@ -476,6 +476,11 @@
       "include": {
         "file": "db/0.0.6/schema/jump_requirements.json"
       }
+    },
+    {
+      "include": {
+        "file": "db/0.0.6/schema/add_index_to_researches.json"
+      }
     }
   ]
 }
diff --git a/src/test/kotlin/com/example/dowstats/service/ModDiffPrinterScript.kt b/src/test/kotlin/com/example/dowstats/service/ModDiffPrinterScript.kt
index 42e8135..7d542b6 100644
--- a/src/test/kotlin/com/example/dowstats/service/ModDiffPrinterScript.kt
+++ b/src/test/kotlin/com/example/dowstats/service/ModDiffPrinterScript.kt
@@ -18,7 +18,7 @@ class ModDiffPrinterScript {
 
     val rgdService = RgdService()
 
-    val prevVersion = "wanila2.8.0"
+    val prevVersion = "wanila2.9.1"
     val currentVersion = "wanila"
 
     val spaceMarinesPath = "space_marines"