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UMP SUBMACHINE GUN
behind the projectile as it passes through the bore and sound suppressor
thus lowering the exit velocity of the bullet below 1,088 feet/second.
Or two, by firing ammunition in the weapon that is down-loaded to a
velocity below the supersonic range. This is the method used in the HK
UMP submachine gun. For this reason this ammunition is termed
“subsonic” and usually falls into the range between 875 – 1,050
feet/second. Both methods are effective but each has it’s own
disadvantages and advantages.
There are two different styles of sound suppressors available for use on
the UMP submachine gun, a quick connect aluminum or stainless steel
sound suppressor.
Both versions are of the “wipeless” design, meaning they have no
rubber or synthetic membranes (wipes) that the bullet must penetrate.
The projectile does not touch any portion of the wipeless sound
suppressor. Wipeless designs are far more durable than other designs
and generally give the best accuracy results.
UMP with quick connect sound suppressor
• The HK UMP submachine guns are designed to be fired using
supersonic or subsonic ammunition with any weight projectile and with
or without the sound suppressor attached.
• The Aluminum Bruegger & Thomet Quick Connect UMP .45 caliber
sound suppressor is 6.70 inches long and weighs .99 pounds. It is
intended to be used with subsonic ammunition for maximum sound
suppression. The UMP does not have a vented barrel as is found
on the HK MP5SD and therefore does not lower the velocity of the
ammunition fired in it. These quick connect sound suppressors can be
used with supersonic ammunition but the supersonic “crack“ of the
projectile will still remain even though the sound suppressor does
eliminate the “muzzle blast” caused by the propellant gases. Other
sound suppressors are available for use on the UMP, contact HK for
additional guidance.
• Accuracy from the quick attach sound suppressor is excellent, often
better than the weapon without the sound suppressor attached,
though there is sometimes a slight change in zero when the sound
suppressor is attached. This is mostly due to the longer distance that
the projectile must pass through (similar to firing through a longer
barrel) on it’s way to the target.
• Effectiveness and service life of sound suppressors varies greatly due
to countless variables. Some of these variables include the type and
quantity of ammunition used, the predominant mode of fire used, the
operational environment in which the weapons are employed, etc.