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CLEANING
Bolt group
Scrub all parts of the bolt group with a toothbrush and solvent where
carbon is visible, especially around the face of the bolt and the
extractor. Do not attempt to remove the extractor for cleaning!
There is no functional need to remove the extractor for normal
cleaning. Remove the loose fouling from all parts using a rag, swabs
or compressed air.
Magazine Don’t forget the magazines! They are very important and very
often overlooked during cleaning. Many stoppages occur as a result of
improperly maintained magazines.
Apply a few drops of solvent to a toothbrush and scrub the top of the
magazine to remove any visible carbon fouling or loose debris. Pay
special attention to the front edge of the housing, feed lips, and the
follower.
Remove the solvent and loose fouling from the magazine using a rag,
swabs or compressed air.
Major Cleaning
As mentioned earlier, Major cleaning should be performed after 1,000
rounds are fired through an unsuppressed UMP or 500 rounds through a
suppressed UMP. Major cleaning is also performed when the weapon
has been immersed in water or is laden with large amounts of visible
foreign matter or fouling.
During Major cleaning, all weapon components except the sound
suppressor and the carrying sling, should be rinsed with or immersed in
solvent and scrubbed thoroughly with a brush. This includes the
magazine and it’s parts. The components can then be dried using a rag
or swabs, though compressed air is preferable for Major cleaning.
If any assembly groups require a more thorough cleaning, an “Ultra-
Sonic” cleaning machine can be used containing any solvent that it is
safe to place your bare hands in, as a general rule.
However, avoid placing painted surfaces such as the firing mode
markings on the lower receiver into an ultra-sonic cleaner, as this may
remove the colored markings. Further disassembly of any assembly
group(s) beyond the level described above must be performed by, or at
a minimum supervised by, an HK factory-trained armorer.