diff --git a/build.sh b/build.sh
index 97dc57f..7866304 100755
--- a/build.sh
+++ b/build.sh
@@ -184,8 +184,80 @@ manage_keystore() {
     create_keystore
 }
 
+copy_apk() {
+    local build_type="$1"
+    local version
+    version="$(get_version_name)"
+
+    local source_apk="app/build/outputs/apk/$build_type/app-$build_type.apk"
+
+    if [[ ! -f "$source_apk" ]]; then
+        error "APK not found at $source_apk"
+        return 1
+    fi
+
+    ensure_dist_dir
+
+    local dest_name="radio247-v${version}-${build_type}.apk"
+    local dest_path="$DIST_DIR/$dest_name"
+
+    cp "$source_apk" "$dest_path"
+
+    local size
+    size="$(du -h "$dest_path" | cut -f1 | xargs)"
+
+    echo ""
+    success "Build complete!"
+    echo ""
+    echo -e "  ${BOLD}APK:${NC}  $dest_path"
+    echo -e "  ${BOLD}Size:${NC} $size"
+    echo ""
+    echo -e "  ${DIM}Share this file with anyone — they can install it${NC}"
+    echo -e "  ${DIM}on Android 9+ by opening the APK on their device.${NC}"
+}
+
+build_release() {
+    info "Preparing release build..."
+    echo ""
+
+    if [[ ! -f "$KEYSTORE_FILE" ]]; then
+        warn "No keystore found. You need one to sign a release APK."
+        echo ""
+        local yn
+        read -rp "Create one now? (y/n) " yn
+        case $yn in
+            [Yy]*) create_keystore || return 1 ;;
+            *)     return 0 ;;
+        esac
+        echo ""
+    fi
+
+    local password
+    read -rsp "Keystore password: " password
+    echo ""
+    echo ""
+
+    info "Building release APK... (this may take a minute)"
+    echo ""
+
+    local store_file
+    store_file="$(cd "$(dirname "$KEYSTORE_FILE")" && pwd)/$(basename "$KEYSTORE_FILE")"
+
+    if ./gradlew assembleRelease \
+        -Pandroid.injected.signing.store.file="$store_file" \
+        -Pandroid.injected.signing.store.password="$password" \
+        -Pandroid.injected.signing.key.alias="$KEY_ALIAS" \
+        -Pandroid.injected.signing.key.password="$password"; then
+
+        copy_apk "release"
+    else
+        echo ""
+        error "Build failed. Check the output above for details."
+        return 1
+    fi
+}
+
 # Placeholder functions — implemented in subsequent tasks
-build_release()    { warn "Not yet implemented"; }
 build_debug()      { warn "Not yet implemented"; }
 clean_build()      { warn "Not yet implemented"; }