Heckler&Koch MR762A1-LRP - Manual (Page 22)

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Cleaning may be completed using dry cleaning solvent, bore cleaner, wiping with a
cloth or an all purpose nylon brush. Using these guidelines will determine which applies.
Cleaning materials are pipe cleaners, swabs, all purpose nylon brush and rags.
NOTE: If cleaning is completed using a solvent, then a coat of lubricant must be
applied for protection against rust and the elements. Dry cleaning solvent may be
used to completely remove lubricants. For example, when moving to extreme cold
weather operations, dry cleaning solvent may be used to remove traces of standard
lubricants before applying a cold weather lubricant like “LAW.”
A variety of high quality lubricants, including some generic “cleaner, lubricant, and
preservative” solutions, LSA (Lubricant, Small Arms) or LAW (Lubricant, Arctic Weather) —
and their commercial equivalents and can be used on HK MR762A1 magazines.
CAUTION: Don’t “dry clean” your magazines. Do not use hot water or other solvents
or you could inadvertently wash away Teflon lubricant that has been building up as
a result of your using some cleaning, lubricant, and preservative solutions. Rifle Bore
Cleaner (RBC) may be used on HK magazines to remove carbon.
Fig. 62 – MR762A1 Magazine
General cleaning is required under normal conditions and the following procedures apply:
1. Always clean after firing, after magazine is wet or in adverse weather conditions.
Remove areas of powder fouling, debris and grit, corrosion and dirt.
2. If magazine is assembled, clean carbon off of follower and feed lips with the all
purpose nylon brush or swab and apply a light coat of lubrication with a clean swab.
If the magazine has been disassembled, then all parts should be thoroughly cleaned
and lubricated before assembly.
NOTE: Do not mix lubricants on the same magazine. The magazine must be thoroughly
cleaned during the change from one lubricant to another. Dry cleaning solvent is
recommended for cleaning during the change from one lubricant to another.
Lube guide
Under all but the coldest Arctic conditions, normal high quality lubricants can be used on
your magazine. Between +10 degrees F (-12°C) and -10 degrees F (-23°C) either normal
high quality lubricants or LAW may be used. Below -10 degrees F (-23°C) use LAW.
Inspection
A visual inspection is recommended each and every time you clean a magazine, the
magazine is disassembled, or a problem exists that could be magazine related. The
following are guidelines that can help in identifying and solving magazine related
problems.
Many problems are very often related to incorrect operator use or maintenance, faulty
ammunition and/or problems in the weapon. These areas should be checked for problems
at the same time the magazine is inspected. If the same problem exists with more than
one magazine, then more than likely it is a rifle, operator, or ammunition problem. When
problems do occur, mark/identify the suspect magazine with a tag or paint/grease pen and
use the following as a guideline. Check for proper assembly. Inspect overall function of
follower (free movement), locking tabs, dents, cracks, etc.
1. Housing: Inspect feed lips for dents and proper spacing, sides for dents, magazine
catch area for worn surfaces or dents, cracks, etc.
2. Follower: Inspect for free movement inside of housing, dents, cracks and deformities.
3. Spring: Inspect for bends, cracks, weak tension.
4. Locking Plate: Inspect for worn or broken tabs. It should retain floor plate and stay
securely attached to the spring.
5. Floor plate: Inspect for bends, cracks and correct fit of the locking tabs into the
locking recess of housing.
6. Rubber bumper: Insure bumper retains floor plate into housing when assembled and
there are no signs of extreme wear.
If any problems are identified, repair or replace as necessary.