Check the listing for details. MP5 Empty Chamber Magnetic Indicator Safety Flag - MP5K SP5 SP5K AP5. Condition: New. Listed at 11.99 USD. This chamber flag is designed to fit into the chamber of your MP5/MP5k to provide a clear indication that the weapon is unloaded and safe. These flags are a required safety item on ALL ranges and a must-have accessory for firearm safety and compliance. Hidden inside the tip are 6 magnets to hold the empty chamber flag in place. These can be used with the bolt open or closed on the flag. This empty chamber flag fits the HK MP5, MP5k, SP5, SP5K and the various clones only. A keychain is included with the empty chamber flag. The Yippee Ki-Yay flag is a special design I made specifically for this empty chamber flag. These are also known by a number of names including Chamber Flag, Breech Flag or Empty Chamber Indicator. This is a 3d printed item and may contain slight imperfections. Thank you for viewing the product.