Here are a couple of excerpts from a Soviet Mosin Nagant Sniper rifle manual.
The same kit was used with all models.
In the picture below, the top kit is the early style and it is a very "rare" item to find. The bottom kit is the most common.
The oiler bottles can be either the round or square and can be found in both single and dual compartment.
65. Accessory Kit (Fig. 62) is used for disassembly, assembly, cleaning and lubricating the rifle. It consists of a jag, bore brush, screwdriver, muzzle cover cap, cleaning rod sleeve (holder) and oil bottle.
Simplified accessory kit also contains a pin and bag. The muzzle cover cap and cleaning rod sleeve (holder) of the combined accessory kit makes a container when connected together.
The jag is used for cleaning and lubrication of the bore. It consists of a sleeve with threads, for screwing on to the cleaning rod and rod with the incision, which will rotate on the rod.
The bore brush is used only for lubrication. It consists of a threaded sleeve (which screws on to the cleaning rod) and a small brush.
The screwdriver is used for disassembly and assembly of the rifle. It consists of a blade and handle. The old model screwdriver has a wooden handle. The container of the combined accessory kit serves as a handle for screwdriver. There are three notches on each side of the blade of the screwdriver: the one in the middle is used to check the protrusion of the firing pin. The other two notches are applied over the edges of the bolt head at the time of the above check. One of the notches is widened so it can be used as a wrench for the firing pin during bolt assembly or attaching the jag to the cleaning rod. The screwdriver from the simplified accessory kit has four notches on its side which are used in the same way as the screwdriver from the combined kit.
The muzzle cover cap protects the bore and muzzle from damage by the cleaning rod or cleaning rod sleeve at the time of cleaning. It has an opening for the cleaning rod and cuts for proper muzzle attachment.
The cleaning rod sleeve (holder) is designed for an easier grip on the cleaning rod at the time of cleaning or lubrication of the bore. It has openings for the cleaning rod and pin.
The oil bottle (dual and single compartment) is used for storing of alkaline solution and gun oil. Dual compartment oil bottle has two compartments that are marked Щ (ShCh) and H (N). The compartment marked with the letter Щ (ShCh) contains alkaline solution; the container marked with letter H contains gun oil. Single compartment oil bottles are used only for gun oil.
INSPECTION OF THE ACCESSORIES
89. Inspect accessories in the following order:
a) verify proper working order of cleaning rod and bore brush. To take out cleaning rod and screw the bore brush on it. Visually examine if cleaning rod or bore brush are bent. Make sure that bore brush is reliably connected and freely rotates on the cleaning rod.
b) check muzzle cover condition. Put it over the muzzle and make sure that it sits tightly without any significant lateral movement. Use bore brush to check for any ware of cleaning rod hole. Bore brush should not fit (come through) muzzle cover opening.
c) verify proper working order(condition) of cleaning rod sleeve, screwdriver and other accessories by checking for cracks or bends.
d) verify proper working condition of the oil bottle. It should not have any cracks. Caps (cap) must have corkwood or rubber seals and screw on tightly. Lubricant must not leak from the bottle or from one compartment to another.
CLEANING AND LUBRICATING THE RIFLE
20. The rifle must be kept clean and in good working condition. This is achieved by periodic inspection, cleaning and oiling.
21. Cleaning the rifle must be done:
a) If used in combat, during manuevers or prolonged duty in the field – daily, during lulls in combat or during breaks in duty;
b) After duty and service in the field without firing – immediately upon completion of training or duty;
c) After firing combat or blank cartridges – immediately at the end of firing (on the shooting-range or in the field) using an alkaline composition to clean the bore, then thoroughly wiping dry and oiling. On the return from shooting or training, to carry out a complete cleaning of the rifle and during the subsequent 3-5 days, repeat the cleaning.
d) If the rifle goes unused for a period not less than once every 7 days.
22. The rifle is to be oiled using gun oil immediately after cleaning in order to prevent moisture contact with the metal.
23. Cleaning and oiling of the rifle by the sniper can be done independently or under the supervision of the commander, who is responsible:
a) To determine the degree of disassembly, cleaning and oiling;
b) To verify proper working order of equipment and the quality of cleaning materials;
c) To verify the quality of the cleaning and then giving permission for oiling the rifle;
d) To verify the correctness of the oiling.
To be used for cleaning and oiling of the rifle:
a) Alkaline solution – for the removal of carbon deposits in the bore and on other parts of the rifle that were exposed to gunpowder gases;
b) Gun oil – for oiling parts of the rifle after cleaning;
c) Winter oil No. 21 – for oiling the parts of the rifle for the low temperatures of winter;
d) Gun Grease - for coating the parts of the rifle for it’s return to the depot for storage;
e) Clean cotton rags or linen scraps – for wiping, cleaning and oiling and also purified oakum for cleaning of the bore.
24. Cleaning and oiling of the rifle is to be done in the following order:
1. Prepare wiping, cleaning and oiling materials;
2. Disassemble the rifle;
3. Check the condition of the cleaning accessories as indicated in paragraph 89.
4. Prepare the cleaning rod. For this, put the rod handle on to the cleaning rod, after which, place the muzzle cover on the cleaning rod and to screw the jag on. Then put the screwdrivers (pin) into the rod handle.
5. To clean the bore, place the rifle into the cuts of the table for cleaning, and in the absence of a table, to rest butt firmly between the knees or onto the ground. Place oakum on the jag. Saturate the oakum with alkaline solution. Insert the cleaning rod into the bore, the length of the jag. Place the muzzle cover onto the barrel. Using one hand, hold the barrel near the muzzle and the other for the rod handle, smoothly run the cleaning rod through the entire length of the bore several times. Replace the oakum and repeat cleaning in this order several times. Remove the muzzle cover and clean the muzzle part of the bore, the depth of the cleaning jag. Wipe the bore using dry oakum and then with clean, dry cloth. Inspect the the cloth, if there are noticeable traces of powder residue (blackness) or of rust, clean the bore again.
Clean the bore repeatedly, until the cloths pulled through the bore are clean. After cleaning the bore, clean the chamber.
After cleaning of the bore and the chamber is completed. Inspect it thoroughly in the light from the muzzle and the breech, turning the rifle in the hands. Pay particular attention to the rifling, there must remain no rust or carbon deposits.
If the jag and cleaning rod get stuck in the bore, pour in a little warmed oil and after a few minutes try to pull the cleaning rod out. If the cleaning rod with the jag cannot be removed, send the rifle to the armorer.
6. Clean the external surface of the barrel and receiver. Clean the notches, grooves, slots and holes using wooden rods and rags. Use of an alkaline solution is acceptable, then wipe dry and oil it using gun oil to prevent the attack of rust.
7. After firing and duties in the field, the boltt must be disassembled and cleaned using rods and rags. Carbon deposits and residue are to be cleaned using rags saturated with an alkaline solution then wiped dry.
8. Clean the outside and inside of the magazine using a wooden rod wrapped with rags.
9. The stock and handguard are to be wiped with dry rags. The metallic parts of the stock are to be cleaned using a rag saturated with an alkaline solution, then wiped dry.
After cleaning the rifle, it is to be wiped down thoroughly using a dry rag.
After the rifle is cleaned, the sniper reports to the squad leader. The squad leader verifies the quality of the cleaning and the proper operation of the rifle. The squad leader then gives permission for the sniper to oil the rifle.
25. Lubrication of the rifle is perfomed in the following order:
1. To oil the bore, screw the brush onto the cleaning rod. Saturate the brush with gun oil (pour a little of the oil onto the brush). Insert the brush into the bore from the muzzle and smoothly run it through the entire length of the bore 2-3 times.
The oiling of the bore using clean rags is allowed with the malfunction of the bristle brush. In this case, the rags should be saturated with gun oil and inserted into the bore at the muzzle. Using the cleaning rod, smoothly run them through the entire length of the bore 2-3 times.
2. To oil all the remaining metallic parts of the rifle (rear sight, magazine, bolt, etc) using oil saturated rags. Oil is to be applied in a thin layer. Excessive oiling promotes the attraction of dirt.
3. The stock and handguard are not to be oiled but to only be wiped dry.
4. To wipe dry and to oil the accessories.
5. After oiling the assembled rifle. It must be inspected for proper assembly and that all the parts operate properly.
Oiling the rifle in the winter must only be done using winter oil N21. The change to winter oil should be done with the onset of frost. When changing to winter oil, the summer oil must be thoroughly removed first. The winter oil should be applied to the rifle in a thin layer using saturated rags.
26. When the rifle is brought in from the cold, into warm surroundings, after 10-15 minutes, must be wiped dry and oiled.
27. When the rifle is returned for prolonged storage, it must be abunduntly coated with gun grease or with a mixture of 50% cannon grease and 50% gun oil.