Heckler&Koch MR762A1 User Manual

Page 23

Fig. 73 – MR762A1 Buttstock Assembly

Fig. 74– MR762A1 Lubricant Guide

LUBRICATION SUMMARY
NO Lubrication: (surface is dry and not slippery to the touch)

• Plastic or rubber components

• Sling webbing

• Optics

LUBRICATION
• Gas Piston and Gas Cylinder,

• Buffer and recoil spring

• Bolt, Bolt carrier, Cam pin and Firing Pin Safety

• Extractor

• Ejector

• Barrel extension

• Bore, chamber, locking surfaces of the chamber and bolt lugs

• Receiver take down and pivot pin

• Hammer, trigger, disconnector springs and selector lever in trigger group

• Piston rod

• All metal parts and/or any area where metal contacts metal.

Magazine Cleaning
There are no special requirements, cleaners, or lubricants for cleaning MR762A1

magazines. The standard cleaning equipment that is used for the rifle may be used for

these magazines. Refer to the care and cleaning section of this operator’s manual for more

detailed information. Do not use metal bristle (brass or steel) or wire brushes to clean the

magazine components as scratches or other damage may occur to the protective qualities

of the surface finish.

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. 75 – 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.