It should not be used with subsonic ammunition with a projectile weight of less than 140 grains! H&K MP5 Operators Manual – MP5SDMP5SD/SD-N with integral suppressorThe MP5SD was designed to be used exclusively with supersonic ammunition with a muzzle velocity of at least 1,088 feet/ second at sea level. SILENCER SATURDAY #75: Cleaning The MP5SDAlso of interesting note is the recommended ammunition that should be run in the MP5SD and the advantages of running standard supersonic 9mm rounds available around the world. I’ve attempted to photograph the ring in place below. Do not apply oil to the outside of the sound suppressor or it will burn off during firing and obscure the firers view of the target.There’s a sealing ring that is in between the silencer and the barrel extension. ( Do Not immerse the sound suppressor in solvent or insert any rods, brushes or patches into the sound suppressor body!Wipe the outside of the sound suppressor off with a clean, oil-free rag. Tap the sound suppressor lightly on a padded surface or blow it out with compressed air to remove any loose fouling from inside the suppressor body. Once you have finished with the flathead screwdriver, use the barrel cleaning device as described above to clean off the remaining carbon particles.For all H&K Sound Suppressors – Use a nylon bristle toothbrush and rag or swab to remove all fouling from the threads of the sound suppressor. Take care only to remove the carbon build up. Remove the carbon by holding the screwdriver on a shallow angle attaching the barrel through the slots in the barrel casing. Keep the screwdriver away from the threads and the front one inch of the barrel, which acts as a bearing surface for the sound suppressor. If possible, cut a dull concave shape into the end of the screwdriver so that it conforms to the outside radius of the barrel to prevent gouging of the barrel’s surface. Work the sound suppressor back and forth along the length of the barrel to break up the ring of carbon so that it can be removed.Once the sound suppressor is removed, use a large, flat head screwdriver to scrape away the build up of carbon on the exterior of the barrel only.
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