diff --git a/src/main/java/group/goforward/ballistic/controllers/admin/AdminPartRoleMappingController.java b/src/main/java/group/goforward/ballistic/controllers/admin/AdminPartRoleMappingController.java
new file mode 100644
index 0000000..7300129
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/controllers/admin/AdminPartRoleMappingController.java
@@ -0,0 +1,123 @@
+package group.goforward.ballistic.controllers.admin;
+
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.model.PartRoleMapping;
+import group.goforward.ballistic.repos.PartCategoryRepository;
+import group.goforward.ballistic.repos.PartRoleMappingRepository;
+import group.goforward.ballistic.web.dto.admin.AdminPartRoleMappingDto;
+import group.goforward.ballistic.web.dto.admin.CreatePartRoleMappingRequest;
+import group.goforward.ballistic.web.dto.admin.UpdatePartRoleMappingRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/admin/part-role-mappings")
+@CrossOrigin
+public class AdminPartRoleMappingController {
+
+    private final PartRoleMappingRepository partRoleMappingRepository;
+    private final PartCategoryRepository partCategoryRepository;
+
+    public AdminPartRoleMappingController(
+            PartRoleMappingRepository partRoleMappingRepository,
+            PartCategoryRepository partCategoryRepository
+    ) {
+        this.partRoleMappingRepository = partRoleMappingRepository;
+        this.partCategoryRepository = partCategoryRepository;
+    }
+
+    // GET /api/admin/part-role-mappings?platform=AR-15
+    @GetMapping
+    public List<AdminPartRoleMappingDto> list(
+            @RequestParam(name = "platform", required = false) String platform
+    ) {
+        List<PartRoleMapping> mappings;
+
+        if (platform != null && !platform.isBlank()) {
+            mappings = partRoleMappingRepository.findByPlatformOrderByPartRoleAsc(platform);
+        } else {
+            mappings = partRoleMappingRepository.findAll();
+        }
+
+        return mappings.stream()
+                .map(this::toDto)
+                .toList();
+    }
+
+    // POST /api/admin/part-role-mappings
+    @PostMapping
+    public AdminPartRoleMappingDto create(
+            @RequestBody CreatePartRoleMappingRequest request
+    ) {
+        PartCategory category = partCategoryRepository.findBySlug(request.categorySlug())
+                .orElseThrow(() -> new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST,
+                        "PartCategory not found for slug: " + request.categorySlug()
+                ));
+
+        PartRoleMapping mapping = new PartRoleMapping();
+        mapping.setPlatform(request.platform());
+        mapping.setPartRole(request.partRole());
+        mapping.setPartCategory(category);
+        mapping.setNotes(request.notes());
+
+        mapping = partRoleMappingRepository.save(mapping);
+        return toDto(mapping);
+    }
+
+    // PUT /api/admin/part-role-mappings/{id}
+    @PutMapping("/{id}")
+    public AdminPartRoleMappingDto update(
+            @PathVariable Integer id,
+            @RequestBody UpdatePartRoleMappingRequest request
+    ) {
+        PartRoleMapping mapping = partRoleMappingRepository.findById(id)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Mapping not found"));
+
+        if (request.platform() != null) {
+            mapping.setPlatform(request.platform());
+        }
+        if (request.partRole() != null) {
+            mapping.setPartRole(request.partRole());
+        }
+        if (request.categorySlug() != null) {
+            PartCategory category = partCategoryRepository.findBySlug(request.categorySlug())
+                    .orElseThrow(() -> new ResponseStatusException(
+                            HttpStatus.BAD_REQUEST,
+                            "PartCategory not found for slug: " + request.categorySlug()
+                    ));
+            mapping.setPartCategory(category);
+        }
+        if (request.notes() != null) {
+            mapping.setNotes(request.notes());
+        }
+
+        mapping = partRoleMappingRepository.save(mapping);
+        return toDto(mapping);
+    }
+
+    // DELETE /api/admin/part-role-mappings/{id}
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void delete(@PathVariable Integer id) {
+        if (!partRoleMappingRepository.existsById(id)) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Mapping not found");
+        }
+        partRoleMappingRepository.deleteById(id);
+    }
+
+    private AdminPartRoleMappingDto toDto(PartRoleMapping mapping) {
+        PartCategory cat = mapping.getPartCategory();
+        return new AdminPartRoleMappingDto(
+                mapping.getId(),
+                mapping.getPlatform(),
+                mapping.getPartRole(),
+                cat != null ? cat.getSlug() : null,
+                cat != null ? cat.getGroupName() : null,
+                mapping.getNotes()
+        );
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/group/goforward/ballistic/model/PartRoleMapping.java b/src/main/java/group/goforward/ballistic/model/PartRoleMapping.java
new file mode 100644
index 0000000..d336815
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/model/PartRoleMapping.java
@@ -0,0 +1,65 @@
+package group.goforward.ballistic.model;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "part_role_mappings")
+public class PartRoleMapping {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+
+    @Column(nullable = false)
+    private String platform;   // e.g. "AR-15"
+
+    @Column(name = "part_role", nullable = false)
+    private String partRole;   // e.g. "UPPER", "BARREL", etc.
+
+    @ManyToOne(optional = false)
+    @JoinColumn(name = "part_category_id")
+    private PartCategory partCategory;
+
+    @Column(columnDefinition = "text")
+    private String notes;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getPlatform() {
+        return platform;
+    }
+
+    public void setPlatform(String platform) {
+        this.platform = platform;
+    }
+
+    public String getPartRole() {
+        return partRole;
+    }
+
+    public void setPartRole(String partRole) {
+        this.partRole = partRole;
+    }
+
+    public PartCategory getPartCategory() {
+        return partCategory;
+    }
+
+    public void setPartCategory(PartCategory partCategory) {
+        this.partCategory = partCategory;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/group/goforward/ballistic/repos/PartRoleMappingRepository.java b/src/main/java/group/goforward/ballistic/repos/PartRoleMappingRepository.java
new file mode 100644
index 0000000..b64889e
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/repos/PartRoleMappingRepository.java
@@ -0,0 +1,12 @@
+package group.goforward.ballistic.repos;
+
+import group.goforward.ballistic.model.PartRoleMapping;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface PartRoleMappingRepository extends JpaRepository<PartRoleMapping, Integer> {
+
+    // List mappings for a platform, ordered nicely for the UI
+    List<PartRoleMapping> findByPlatformOrderByPartRoleAsc(String platform);
+}
\ No newline at end of file
diff --git a/src/main/java/group/goforward/ballistic/web/dto/admin/AdminPartRoleMappingDto.java b/src/main/java/group/goforward/ballistic/web/dto/admin/AdminPartRoleMappingDto.java
new file mode 100644
index 0000000..1146848
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/web/dto/admin/AdminPartRoleMappingDto.java
@@ -0,0 +1,10 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record AdminPartRoleMappingDto(
+        Integer id,
+        String platform,
+        String partRole,
+        String categorySlug,
+        String groupName,
+        String notes
+) {}
\ No newline at end of file
diff --git a/src/main/java/group/goforward/ballistic/web/dto/admin/CreatePartRoleMappingRequest.java b/src/main/java/group/goforward/ballistic/web/dto/admin/CreatePartRoleMappingRequest.java
new file mode 100644
index 0000000..74445c9
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/web/dto/admin/CreatePartRoleMappingRequest.java
@@ -0,0 +1,8 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record CreatePartRoleMappingRequest(
+        String platform,
+        String partRole,
+        String categorySlug,
+        String notes
+) {}
\ No newline at end of file
diff --git a/src/main/java/group/goforward/ballistic/web/dto/admin/UpdatePartRoleMappingRequest.java b/src/main/java/group/goforward/ballistic/web/dto/admin/UpdatePartRoleMappingRequest.java
new file mode 100644
index 0000000..b70b9f6
--- /dev/null
+++ b/src/main/java/group/goforward/ballistic/web/dto/admin/UpdatePartRoleMappingRequest.java
@@ -0,0 +1,8 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record UpdatePartRoleMappingRequest(
+        String platform,
+        String partRole,
+        String categorySlug,
+        String notes
+) {}
\ No newline at end of file