Just use inline validation instead of form request, since it's a one-off

app/Http/Controllers/ComponentsController.php

@@ -8,7 +8,6 @@ use App\Models\Component;
 use App\Models\Setting;
 use App\Models\User;
 use App\Models\Asset;
-use App\Http\Requests\ComponentCheckoutRequest;
 use Auth;
 use Config;
 use DB;
@@ -19,6 +18,8 @@ use Redirect;
 use Slack;
 use Str;
 use View;
+use Validator;
+use Illuminate\Http\Request;
 
 /**
  * This class controls all actions related to Components for
@@ -302,9 +303,12 @@ class ComponentsController extends Controller
     * @param int $componentId
     * @return Redirect
     */
-    public function postCheckout(ComponentCheckoutRequest $request, $componentId)
+    public function postCheckout(Request $request, $componentId)
     {
-      // Check if the component exists
+
+
+
+        // Check if the component exists
         if (is_null($component = Component::find($componentId))) {
             // Redirect to the component management page with error
             return redirect()->to('components')->with('error', trans('admin/components/message.not_found'));
@@ -312,6 +316,19 @@ class ComponentsController extends Controller
             return redirect()->to('admin/components')->with('error', trans('general.insufficient_permissions'));
         }
 
+
+        $max_to_checkout = $component->numRemaining();
+        $validator = Validator::make($request->all(),[
+            "asset_id"          => "required",
+            "assigned_qty"      => "required|numeric|between:1,$max_to_checkout"
+        ]);
+
+        if ($validator->fails()) {
+            return redirect()->back()
+                ->withErrors($validator)
+                ->withInput();
+        }
+
         $admin_user = Auth::user();
         $asset_id = e(Input::get('asset_id'));
 
@@ -320,7 +337,7 @@ class ComponentsController extends Controller
             // Redirect to the component management page with error
             return redirect()->to('admin/components')->with('error', trans('admin/components/message.asset_does_not_exist'));
         }
-
+        
       // Update the component data
         $component->asset_id =   $asset_id;