Details matter and Timber Creek Outdoors is all about the details. The Timber Creek Outdoors Forward Assist Assembly is a drop-in replacement compatible for use with Mil-Spec AR-15 and AR-10 upper receivers. Product Features Includes spring and roll pin Product Specifications Make: Timber Creek Model: TCO AR Forward Assist Assembly Fits: AR-15 | AR-10 Color: Burnt Bronze Cerakote