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32
UMP SUBMACHINE GUN
compressed air.
Forearm / foregrip Remove any foreign debris from the forearm or
optional foregrip using a toothbrush, rag or compressed air.
Upper receiver with barrel Start with the bore and chamber.
• Bore – Apply a liberal amount of solvent to a bronze bristle bore
brush of the appropriate caliber. Always insert the bore brush from the
chamber end and push it all the way through the barrel in the direction
that the bullet travels. Pull the brush back through the barrel. DO NOT
allow the brush to stop in the bore or it may get stuck! Repeat this
in/out procedure for a minimum of three complete trips. Remove the
bore brush and let the solvent work in the bore for a few minutes
while you clean other components.
• Chamber – Apply a liberal amount of solvent to the appropriate bore
brush. Insert the brush through the back of the receiver into the
chamber. DO NOT push the brush past the chamber! Work the brush
back and forth in the chamber at least three times. Remove the brush
and let the solvent go to work on the fouling for a few minutes while
you work on other components.
• Chamber face – This area is easily tackled using the special
Chamber Face brush available in the HK Field Weapons Cleaning Kit
for the UMP submachine gun. Attach this brush to the cleaning rod
and lock the handle so that the rod and brush can be turned together.
Apply a liberal amount of solvent to the bristles of the brush. Insert the
brush through the back of the receiver until it makes contact with the
area surrounding the opening to the chamber and bore. With slight
inward pressure, rotate the brush in a clockwise direction to break up
the carbon fouling built-up on the face of the chamber. Continue this
procedure until you are satisfied with your efforts.
• Upper Receiver – Apply a few drops of solvent to a toothbrush and
scrub the area around the chamber face and along the length of the
receiver rails to break-up the carbon fouling.
• Muzzle and accessory attachment interface – Use a nylon bristle
toothbrush and a small amount of solvent to remove any fouling from
the muzzle where the sound suppressor and muzzle mounted
accessories attach. Remove all of the fouling, carbon, and visible
debris from the entire upper receiver using a solvent tank and
compressed air or swabs, patches, rags, etc. Run al least three clean
patches of the appropriate size all the way through the bore in the
direction of bullet travel to remove the loose fouling and solvent.