Heckler And Koch HK UMP45, UMP40 Operators Manual
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31 CLEANING Normal cleaning Performed after each firing or every twelve (12) months. Major cleaning Often referred to as “detailed cleaning”. Performed on an unsuppressed UMP after 1,000 rounds (500 for a suppressed UMP) or when the weapon is exposed to or excessively laden with sand, dust, water or other visible contaminants or foreign matter. • The cleaning intervals listed here are recommendations only! • Your intervals between cleaning will vary greatly depending on many factors to include the type...
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32 UMP SUBMACHINE GUN compressed air. Forearm / foregripRemove 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...
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33 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. MagazineDon’t forget the magazines! They are very important and very often overlooked during cleaning. Many stoppages occur as a result...
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34 UMP SUBMACHINE GUN Operator inspection During or after cleaning the operator should inspect the weapon and it’s components for any irregularities that may causes problems during it’s operation. If any potential deficiencies are noted, they should be corrected immediately and/or brought to the attention of the unit armorer. In general, the operator should keep a watchful eye out for the following discrepancies both in the weapon as a whole and in each assembly group. • Improper function • Missing...
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35 LUBRICATION • All metal accessories Medium Lube – (finger run across surface yields some lube but lube does not run down surface when held in a vertical position) • Bolt group with recoil spring and guide rod Heavy Lube – (Lube runs down surface when held in a vertical position) No heavy lube is required on the HK UMP! • Reapply lubrication to the bolt of the UMP periodically during firing as it burns off from the heat. Sound suppressed weapons generate more smoke and noxious gases especially when...
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36 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...
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37 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...
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38 UMP SUBMACHINE GUN Ammunition The UMP submachine gun was designed to use ammunition designed to NATO or SAAMI specifications. Like an automobile engine, you cannot expect top performance by using poor quality fuel. The same applies to firearms. There are a number of general considerations that should be made when choosing the type of ammunition you plan to use in the UMP. DO USE • Ammunition of the appropriate caliber and of recent manufacture • Clean burning ammunition • Non-corrosive ammunition •...
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39 TROUBLESHOOTING 5. Next, determine and eliminate the cause of the stoppage. The items indicated in the following tables do not cover all stoppages theoretically possible. A given stoppage may also have been caused by other reasons than the ones indicated. Stoppage Cause Remedy Cartridge not ignited Ammunition fault Recock UMP (Dud round) Firing pin damaged Take UMP to or broken maintenance shop Hammer spring damaged Take UMP to damaged or broken maintenance shop Bolt did not stay open on...
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40 UMP SUBMACHINE GUN Stoppage Cause Remedy No cartridge fed by bolt. Magazine not properly Insert magazine properly. inserted. Magazine loose Check magazine catch and notch on magazine. If required take UMP to maintenance shop. Follower spring lame Replace magazine or follower spring and take to maintenance shop. Magazine lips damaged Replace magazine or magazine housing and take the damaged one to maintenance shop Bolt not fully closed. Cartridge chamber dirty Clean cartridge chamber. Cartridge...