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SOUND SUPPRESSOR
Generally, the aluminum Bruegger & Thomet UMP sound
suppressors when used with the recommended ammunition provide
20–25 decibels (dBA) sound reduction when compared to an
unsuppressed weapon.
• An aluminum sound suppressor will generally maintain its
effectiveness to 20,000 rounds; stainless steel suppressors to 40,000
rounds or more.
• Older sound suppressors can be replaced by the operator for a
reasonable cost. Many teams will keep the older sound suppressor for
training and maintain the newer one for operational use where peak
performance is desired.
Observe the following recommendations
• DO NOT attempt to open the sealed sound suppressor body
• DO NOT allow the sound suppressor to loosen during use.
• DO NOT use any form of tool or wrench to install or remove the
sound suppressor.
• Always tug forward on the UMP sound suppressor after mounting to
ensure that it is properly attached.
• If the sound suppressor will not detach from the weapon, consult the
section entitled “Normal Cleaning” of the sound suppressor or call
Heckler & Koch for guidance.
• DO NOT fire the UMP with the aluminum sound suppressor full of
water. Allow the water to drain from the sound suppressor before
attempting to fire the weapon.
• DO NOT attempt to fire the weapon if the sound suppressor has been
dented or damaged or there is damage around the exit hole or if the
sound suppressor fits loosely on the weapon.
• DO NOT insert anything into the body of the sound suppressor such
as a cleaning rod or brush.
• DO NOT add to or fire the weapon with oil, grease or any foreign
matter inside unless directed to by the manufacturer of the specific
sound suppressor.
• Keep the muzzle and attachment interface for the sound suppressors
and muzzle mounted accessories as clean as possible at all times to
insure that the sound suppressor and accessories can be easily
attached and detached when required. Clean the muzzle with a nylon
toothbrush or patch soaked in oil or solvent during each cleaning.
Lightly lube the muzzle once it is clean. A dirty muzzle can make it
very difficult to attach and detach the sound suppressor.