Operator Cleaning

The functional performance of any mechanical device varies greatly on the quality and frequency of the maintenance performed on that item. Firearms are no exception. The operator spends most of the time with the weapon and therefore has the best opportunity to perform the necessary upkeep required to insure top performance at all times.

New HP5's are coated in a thick, oily preservative that should be removed prior to the weapon being used or fired. This preservative oil, applied by H&K personnel prior to the shipment of the weapons from the manufacturing facility in Germany, guarantees that the weapons and accessories will remain corrosion**free during storage and transport. However, this preservative fluid is not considered a lubricant and therefore should be removed and replaced with a high-qual 1 ty weapons lubr leant whenever poes ibl e. This preservative fluid attracts debris and dirt and possesses little or no lubricating qualities.

Cleaning the MPS need not take hours and a great deal of effort. With the right equipment a very fouled MPS should be able to be thoroughly cleaned in less than 10-12 minutes. A solvent tank where the parts can be immersed in and scrubbed will save a great deal of time and effort as will compressed air to blow off the fouling and Solvent or to spread the lubricant. There are companies, such as "Safety-Kleen", that sell or rent such solvent tanks and will exchange the solvent on a regular basis at a reasonable price.

If such a set up is not available to you, a complete weapons cleaning kit specially designed for the H&K MP5 will reduce your cleaning time and make the job easier.

H&K's own "Modular Weapons Cleaning Kit" contains all of the specialty brushes (chamber, bore, and chamber face) designed specifically for thorough cleaning of the H&K MP5. The following cleaning procedures are based on the use of this kit.

Any quality weapons solvent or oil can be used to clean the MP5. Basically, if it's safe to put your bare hands into it won't hurt the surfaces of the weapon. "Break-Free" (CLP), "Ballistol", or any of the other brand-name cleaners or lubricants specifically designed for use with weapons will work well on the MP5.

At HicK we recommend two types of operator cleaning. Normal cleaning and Major cleaning.

Normal cleaning - Performed after each firing 'or every twelve (12) months.

Major cleaning - Often referred to as "detailed cleaning". Performed on an unsuppressed MP5 after 1,000 rounds (500 for a suppressed MP5) 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 onlyl Your intervals between cleaning will vary greatly depending on many factors to include the type of ammunition used, the environment in which the weapon is operated, and the thoroughness of your cleaning, etc.)



2. Disassemble the weapon into the major assembly groups.

3. A. Sound Suppressor, aluminum or stainless steel (where applicable)

On the MP58D onlyr attach the optional Barrel Cleaning Device (H&K ID # 225376) to the end of the sound suppressor body. Push the entire assembly over the end of the barrel all the way down until the cleaning device (similar to a battery terminal cleaning brush used on car batteries) makes contact with the base of the barrel. Rotate the sound suppressor and the cleaning device in a clockwise direction 6-7 complete turns and remove.

This will clean the exterior of the barrel and the thirty (30) barrel ports that vent the propellent gases (and carbon) into the sound suppressor vhen the veapon is fired.

In a weapon with a severe buildup of carbon on the outside surface of the barrel the sound suppressor may be difficult to unscrew or remove from the barrel. This excessive buildup occurs when the barrel cleaning device is not used frequently enough during and/or after firing. The carbon has accumulated to the point where it bonds the sound suppressor to the threads of the barrel.

At this point a more aggressive cleaning method must be taken. Remove the sound suppressor without using tools. Have one person hold the weapon down while the other unscrews the sound suppressor. For a sound suppressor that is impossible to remove immerse the upper portion of the sound suppressor and barrel in solvent to help loosen the carbon bond. Let the solvent work for one hour. Try again to remove the sound suppressor, with your bare hands only. The use of tools to try and remove the sound suppressor will damage the aluminum housing and destroy the unit. If at this point you can still not unscrew the sound suppressor, contact H&K's Repair Department for further assistance.

Once the sound suppressor is unscrewed it may be difficult to slide it off of the barrel over the ring of carbon built up around the gas ports. Work the eound suppressor back and forth along the length of the barrel to break up the ring of carbon so that it can be removed.

Once the sound suppressor is removed, use a large, flat head screwdriver to scrape away the build up of carbon on the exterior of the barrel only. If possible, cut a dull concave shape into the end of the screwdriver so that it conforms to the outside radius of the barrel to prevent gouging of the barrel's surface. Keep the screwdriver awav from the threads and the front one inch of the barrel. which acts as a bearing surface for the sound suppressor. Remove the carbon by holding the screwdriver on a shallow angle attaching the barrel through the slots in the barrel casing. Do not use too much force. Take care only to remove the carbon build up. Once you have finished with the flathead screwdriver, use the barrel cleaning device as described above to clean off the remaining carbon particles.

Sound suppressors - ttee a nylon bristle toothbrush and rag or swab to remove all fouling from the threads of the sound suppressor. Tap the sound suppressor lightly on a padded surface or blow it out with compressed air to remove any loose fouling from inside the suppressor body. fDo Not immerse the sound suppressor in solvent or insert any rods, brushes or patches into the sound suppressor bodyI

Wipe the outside of the sound suppressor off with a clean, oil-free rag. Do not apply oil to the outside of the sound suppressor or it will bum off during firing and obscure the firers view of the target.

Multi-purpose carrying sling

The cotton webbing of the multi-purpose carrying sling can be cleaned using warm soap and water and a soft bristled brush. Allow the sling material to dry completely before storage or use.

The metal components of the sling and the ambidextrous sling mounting pins can be cleaned using standard weapons solvents and oils.

Buttstook or buttcap

Simply remove any foreign debris from the exterior of these parts using a toothbrush, rag, swabs or compressed air When available.

Trigger group

Remove any foreign debris from the plastic pistol grip using a toothbrush, rag, swabs or compressed air.

Scrub the top of the hammer, ejector and the area around the front of the ejector and release lever with a small amount of solvent or oil to break up the carbon fouling.

Remove the loose fouling and debris by rinsing the metal components in the a solvent tank or by using rags, swabs, or compressed air.

forearm or foregrip

Remove any foreign debris from the forearm or foregrip using a toothbrush, rag or compressed air.

F. Receiver/barrel group

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 1 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 and flutes - Apply a liberal amount of solvent to the appropriate chamber brush. Insert the chamber brush through the back of the receiver into the chamber. DO NOT push the chamber brush past the chamber! work the chamber brush back and forth in the chamber at least three times. Remove the chamber brush and let the solvent go to work on the fouling for a few minutes while you work on other components.

Chamber face and barrel extension - Often considered the hardest area to clean in the MP5, it is easily tackled using the special Chamber Face brush available in the H6K Modular Weapons Cleaning Kit for 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 and the solid cylindrical metal piece that the barrel is pressed into (called the barrel extension).

With slight inward pressure, rotate the brush in a clockwise direction to break up the carbon fouling built-up on the inside radius of the barrel extension and on the face of the chamber. Use the same procedure through the magazine well and bottom of the receiver to reach the entire radius of the barrel extension. Continue this procedure until you are satisfied with your efforts.

Receiver - Apply a few drops of solvent to a toothbrush and scrub the area around the barrel extension and along the length of the receiver rails to break-up the carbon fouling.

Muzzle threads on «Navy» models, MP5K-PDW, MP5/10 and MPS/4 o - Use a nylon bristle toothbrush and a small amount of solvent to remove any fouling from the muzzle threads where the screw-on suppressor attaches and from the protective cap that covers the threads when the suppressor is not attached.

Remove all of the fouling, carbon, and visible debris from the entire receiver/barrel group using a solvent tank and compressed air or swabs, patches, rags etc.

Run at 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.

G. Bolt group

Scrub all parts of the bolt group with a toothbrush and solvent where carbon in visible, especially around the extractor and the bolt rollers, insure that the rollers are clean enough that they move in and out easily. Use the locking piece to force the rollers out of the bolt head for easier cleaning with the toothbrush.

PP HOT g«9Tt thf «tMCtMLg« Cleaning! You may damage the extractor spring. 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«

H. Magasine

Don't foroet the ^aoazinesl 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, the feed lips and the follower.

Remove the solvent and loose fouling from the magazine using a rag, swabs, or compressed air«

As mentions* earlier, Major cleaning should be performed after 1,000 rounds are fired through an unsuppressed HPS or 500 rounds through a suppressed HPS. Major cleaning is also performed when the weapon ha s been immersed i n water or i s 1 aden wi th 1 arge amounts of visible foreign matter or fouling.

During Major cleaning, all weapon components except the 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 "Ultrasonic" cleaning machine can be used containing any solvent that it is safe to place your bare hands in, as a general rule. Further disassembly of any assembly group(s) beyond the level described above pust be performed by, or at a minimum supervised by, an H*K factory-trained armorer.

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