Help Us Help You Ensure That You Have The Right Drilling Fixture: 1. This drilling fixture is ONLY for Pike Arms® TAKEDOWN 80% receivers blanks. It will work with both / either the flat top receiver or the picatinny rail receiver. 2. It will NOT work with a non-takedown Pike Arms® 80% receiver. 3. It will NOT work with other manufacturer's receivers 4. It can NOT be returned and is a final sale. INFORMATION ON DISCONTINUED DRILLING FIXTURE COMPATIBILITY: The discontinued takedown drilling fixture (part # 08525) will ONLY work on Pike Arms® flat top 80% receivers and should NOT be used on Pike Arms® integral picatinny rail receivers. Pike Arms® 80% takedown receivers with integral picatinny rails should only be completed with this drill fixture part # 09225.