Hunting rifle MP-155 - one of the most popular smooth-bore weapons among Russian hunters due to its reliability and simplicity of design. However, even such a time-tested gun requires regular maintenance, and for proper cleaning or repair it must be properly disassembled. Improper disassembly can result in damaged mechanisms, loss of parts, or even personal injury.
In this article we will analyze the disassembly process in detail. MP-155 — from preparing the workplace to the nuances of working with individual components. You will learn what tools you will need, how to avoid common mistakes and what to do if the gun “jams” when disassembled. We will pay special attention to safety measures: working with weapons always requires concentration and compliance with the rules.
If you are a beginner, do not rush to disassemble the gun immediately after reading - first read the instructions in full and prepare everything you need. Experienced hunters will also find useful life hacks here, for example, how to simplify assembly or check the condition of springs without special tools.
Preparing for disassembly: tools and work area
Before you start disassembling MP-155, make sure the gun discharged and there are no cartridges in the chamber. Even if you are sure that the weapon is empty, visually check the barrels and breech. This is rule number one, which cannot be ignored.
For disassembly you will need:
- 🔧 Flat blade screwdriver (preferably magnetic so as not to lose small parts).
- 🔨 Hammer with rubber head (for carefully knocking out the pins).
- 📦 Container for small parts (a plastic box with cells or even an egg tray will do).
- 🧴 Rags or napkins (to wipe parts and not stain the work surface).
- 📸 Smartphone for photography (note each stage of disassembly - this will help during reassembly).
The workplace should be well lit and spacious. A table with a flat surface, covered with a light cloth, is ideal (this makes it easier to notice fallen parts). Avoid drafts - small springs or pins can easily fly away.
If you are disassembling a gun for the first time, place a diagram next to it. MP-155 (This can be found in the operating instructions or on the Internet). This will help you quickly navigate if something goes wrong.
Complete disassembly of MP-155: step-by-step process
Disassembly MP-155 can be roughly divided into two stages: incomplete (for normal cleaning) and full (for deep maintenance or repair). We will consider a complete disassembly, since it includes all the steps of an incomplete one.
Start with the department receiver from box:
- Open the gun by moving the locking lever to the "open" position.
- Click on handguard latch (located in front under the barrels) and remove the forend by sliding it forward.
- Turn it inside out receiver mounting screw to the stock (located under the trigger).
- Carefully separate the receiver from the stock, holding it with your hand.
Now you can start disassembling trigger mechanism (trigger mechanism):
- 🔩 Remove the two trigger mounting screws (they are located on the side of the receiver).
- 📍 Remove the trigger assembly, holding it from below so that the springs do not fall out.
- ⚙️ Disassemble the trigger into its component parts: trigger, sear, mainspring and triggers.
For disassembly bolt carrier and extractor You will need to knock out a few pins. Use a rubber-faced hammer and a mandrel of the appropriate diameter to avoid damaging the metal. The pins may be tight - do not use too much force to avoid bending the frame.
Check that the gun is unloaded|Prepare a container for small parts|Take a photo of the original position of the springs|Do not mix parts from different units-->
Common mistakes during disassembly and how to avoid them
Even experienced hunters sometimes make mistakes when disassembling MP-155, which can lead to breakdowns or long assembly times. Here are the most common of them:
1. Loss of small parts. Springs, pins or balls from the extractor are easily lost, especially if disassembly occurs on the floor or table without edges. Always use a high-sided container or magnetic mat.
2. Use of excessive force. If the part does not give in, there is no need to hit it with a hammer or bend it. Most likely, you missed the fastener or did not fully remove the screw. Stop and check the instructions again.
3. Wrong sequence. For example, if you first remove the hammers and then try to remove the mainspring, you can damage the mechanism. Always follow the order described in the manual.
4. They forget to photograph the process. Without a photo, it’s difficult to remember exactly how a particular part was installed, especially if disassembly took several days.
Lost small parts|Couldn't put it back together|Broken a part due to excessive force|No problems|Other-->
Pay special attention mainsprings. They are in a tense state, and if handled carelessly, they can “shoot”, injuring your hand. Always hold the springs when removing them and place them in a separate place, away from other parts.
⚠️ Attention: If you notice that there are traces of corrosion or mechanical damage on the trigger parts (burrs, cracks), do not continue disassembling. Contact a gunsmith—in this case, repairing it yourself can be dangerous.
Cleaning and lubrication after disassembly
A disassembled gun is the perfect time for a deep cleaning. Start with trunks:
- 🧹 Pass through each trunk brush, soaked in a solvent (for example, RFS or kerosene).
- 🧼 Wipe the barrel channels with a rag until the soot is completely removed.
- 🔍 Inspect the trunks for rust or deformation. If corrosion is detected, use a special paste (for example, TMS).
For cleaning USM parts Use wooden or plastic chopsticks - metal objects may leave scratches. Pay special attention to:
- Triggers and sear (remove dirt from grooves).
- Mainsprings (wipe them with a dry cloth, no lubrication is needed here).
- Trigger (check free movement).
After cleansing, apply thin layer of lubricant on rubbing surfaces. For MP-155 gun oil is suitable (for example, Ballistol or LPX). Do not overdo it - excess lubricant attracts dust and can cause jamming. The exception is mainsprings: they should absolutely not be lubricated, as this can lead to misfires or spontaneous shots.
| Detail | Cleaning | Lubrication | Notes |
|---|---|---|---|
| Trunks | Brush + solvent | Light layer of oil | Wipe dry after cleaning |
| USM (except springs) | Rags + wooden stick | Thin layer on rubbing parts | Avoid getting oil on the sear |
| Mainsprings | Dry rags | Do not lubricate! | Lubrication can cause misfires |
| Extractor | Solvent + toothpick | Minimum quantity | Check freedom of movement |
Assembling MP-155: tips and tricks
Assembling a gun is often more difficult than disassembling it. To avoid problems, follow these tips:
1. Start with USM. Reinstall the mainsprings and secure them before installing the hammers. This will prevent the spring from “shooting” during further assembly.
2. Check for freedom of movement. After installing each part, make sure it moves without jamming. For example, the trigger should be pressed smoothly, without squeaks.
3. Use photos. If you took photographs of the disassembly process, check them at each stage. Pay attention to the position of small parts such as clips or balls.
4. Do not tighten the screws immediately. First, assemble all the components with “fixed” screws, then check the operation of the mechanisms and only after that tighten the fasteners. This will help avoid distortions.
Pay special attention combining the receiver with the stock. The fastening screw should go in without effort - if it does not fit into the thread, do not try to screw it in by force. Go back a step and check that all the parts are installed correctly.
If after assembly the gun does not fire or misfires occur, disassemble the trigger again and check the position of the mainspring - it should press freely on the triggers without clinging to other parts.
What to do if the gun doesn't assemble?
The situation when after disassembly MP-155 It’s not possible to put it back together; it’s familiar to many hunters. Most often the problem lies in three things:
1. Springs are installed incorrectly. Main or return springs may be twisted or installed in the wrong grooves. Disassemble the assembly and compare it with photographs or a diagram.
2. Distortion of parts. For example, if the triggers are not installed symmetrically, the receiver will not sit in place. Check visually that all parts are in the correct position.
3. Foreign objects. Sometimes rags, pieces of cleaning sticks, or even forgotten tools get into the mechanism. Shake the gun (after making sure that it is unloaded!) and listen to see if there is anything unnecessary rattling inside.
If the gun is assembled, but the shutter does not close, check:
- 🔫 Position extractor - it should not rest against the trunks.
- 🔄 Job locking lever - it must move freely.
- 🛠️ Condition locking lugs on the receiver (they may be dirty or deformed).
⚠️ Attention: If you can't assemble the gun within an hour, don't keep trying. Contact a gunsmith - further manipulations may worsen the problem. This is especially true when parts are jammed or do not fall into place.
How to check the operation of the trigger after assembly?
After assembling the gun, be sure to check the operation of the trigger mechanism idle (without cartridges!):
1. Move the safety switch to the "fire" position.
2. Press the trigger - the hammers should be cocked.
3. Close the gun and press the trigger again - the hammers should be released from the cocking position.
4. Repeat the check 2-3 times for each barrel.
If at least one of the stages is stuck, disassemble the trigger again and find the reason.
MP-155 maintenance: how to extend the life of your gun
Regular disassembly and cleaning is only part of the maintenance. MP-155. To ensure that your gun lasts for decades, follow these recommendations:
1. Clean after every hunt. Even if you didn't shoot, moisture or dust could get into the barrels. Simply wipe the channels with a dry cloth and apply a thin layer of oil.
2. Keep your gun in a case. This will protect it from dust and mechanical damage. The ideal option is a case with a hygroscopic liner that absorbs moisture.
3. Check the fastening of the barrels. Over time, the screws may loosen, which will lead to a decrease in the accuracy of the battle. Tighten all fastenings once a season.
4. Monitor the condition of the stock. Wood can crack or warp over time. Regularly treat the stock with special oil or wax.
5. Do not use homemade ammunition. MP-155 designed for standard factory ammunition. Homemade cartridges can lead to swelling of the barrels or damage to the trigger.
If you notice that the accuracy of the battle has deteriorated, the gun has become worse at closing, or extraneous sounds appear when shooting, this is a signal that it’s time to carry out deep service. In such cases, it is better to contact a professional, as the problem may lie in the wear of critical parts.
FAQ: answers to frequently asked questions
Is it possible to disassemble the MP-155 without experience?
Yes, but only if you have carefully studied the instructions and prepared everything you need. The first disassembly is best done under the guidance of an experienced hunter or gunsmith. Start with partial disassembly to get used to the mechanism.
How often should a gun be completely disassembled?
It is recommended to carry out complete disassembly 1-2 times a year, even if the gun is rarely used. After intensive hunting (for example, the autumn-winter season), disassembly is mandatory.
How does disassembling the MP-155 differ from the MP-153?
The basic principles are similar, but MP-153 has a different extraction mechanism and a slightly different trigger design. Parts are not interchangeable! Always use the instructions specifically for your model.
Is it possible to lubricate mainsprings?
No! Lubrication on the mainsprings causes them to stick, which can lead to misfires or, conversely, spontaneous shots. The springs must remain dry.
Where can I download the MP-155 diagram?
The official diagram can be found in the instruction manual that came with the gun. Schemes are also posted on hunters’ forums (for example, on Guns.ru or Okhotnik.ru) or in thematic groups on social networks.