Some types of ammunition, such as the FN 5.7 mm rounds, are modified with a non-stick coating. This coating is applied to enhance the performance of the ammunition by reducing friction and improving feeding reliability in firearms. The non-stick finish helps prevent the buildup of residue and fouling, which can occur during firing. As a result, this modification can lead to smoother operation, increased accuracy, and easier maintenance of the firearm. The use of non-stick coatings in ammunition is part of ongoing advancements in ammunition technology aimed at improving overall efficiency and effectiveness.