The Field edition has no windows and is for the shooter who doesn?t like windows. Basically each edition is based on the intended use of the pistol. The M&P Slide Package will come with a custom set of Dawson Precision Sights, Titanium Screws for the Battle Plate and a custom Agency “A” Slide Back plate. **Please note if you plan on running suppressor height sights, you will need a custom set. For more information please contact us** (All slide work is completed on a customer supplied Slide)