This specific fastener secures the buttstock to the receiver of a Makarov 90 rifle, a semi-automatic variant of the AKM pattern rifle. It’s a critical component for proper function and safe operation, ensuring stability and accuracy. Different types of buttstocks may require specific fasteners, emphasizing the need for correct identification and usage.
Properly securing the stock contributes significantly to the rifle’s overall integrity, influencing user comfort, control, and aiming. Historically, similar retaining mechanisms have been essential in firearm design, highlighting their importance in maintaining weapon stability and effectiveness. A loose or missing fastener can negatively impact accuracy and potentially create a safety hazard.
Further exploration of this topic will cover appropriate installation techniques, compatible buttstock types, and troubleshooting common issues related to this component. This information aids in maintaining the rifle’s safe and effective operation.
1. Dimensions
Proper functionality and secure attachment of the stock to a Mak 90 rifle depend critically on the precise dimensions of the retaining screw. Variations can lead to instability, impacting accuracy and potentially causing damage. Understanding these dimensional factors is crucial for maintaining the rifle’s structural integrity and safe operation.
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Length
Screw length must precisely match the receiver and stock configuration. An overly long screw can interfere with internal components or protrude, while a short screw fails to provide adequate clamping force, leading to a loose and potentially dangerous stock. Using calipers or a ruler to measure the existing screw ensures accurate replacement.
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Diameter/Thread Pitch
The screw’s diameter and thread pitch must correspond with the threaded receptacle in the receiver. An incorrect diameter prevents proper engagement, and an incompatible thread pitch can damage the receiver threads. Consulting manufacturer specifications or comparing the existing screw with replacements confirms compatibility.
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Head Type and Size
The screw head must be appropriately sized and shaped for the stock’s mounting hardware. A head that is too large may not fit flush, while one too small provides insufficient bearing surface. Common head types include slotted, Phillips, and hex. Matching the head type to the appropriate driver ensures proper installation and prevents damage.
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Material and Finish
While not strictly dimensional, the screw’s material and finish influence its interaction with the surrounding components. Steel, with appropriate hardening and a protective finish, is typically used for durability and corrosion resistance. Inspecting the existing screw helps determine the appropriate replacement material and finish.
Careful consideration of these dimensional factors ensures proper fit and function, contributing to the rifle’s overall safety and performance. Neglecting these details can compromise the structural integrity of the firearm and create potential hazards. Precise measurements and careful selection are therefore essential when replacing this critical component.
2. Material
The material composition of a Mak 90 stock screw directly influences its durability, corrosion resistance, and overall performance. Selecting the appropriate material is crucial for maintaining the structural integrity of the rifle and ensuring safe operation. Different materials offer varying properties, impacting their suitability for this specific application.
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Steel
Steel, often hardened and treated for enhanced durability, is a common choice. Its high tensile strength resists deformation under stress, providing a reliable and secure attachment. Various steel alloys, each with unique properties, might be employed, offering different levels of hardness and corrosion resistance. For example, a hardened steel screw provides greater shear strength than a standard steel screw.
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Stainless Steel
Stainless steel offers superior corrosion resistance compared to standard steel, making it suitable for environments with high humidity or exposure to moisture. This added protection against rust and other forms of corrosion contributes to the longevity of the component. Different grades of stainless steel offer varying levels of corrosion resistance and strength. Marine-grade stainless steel, for example, offers exceptional corrosion protection in harsh environments.
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Titanium
Titanium, while less common, provides an exceptionally high strength-to-weight ratio. Its inherent corrosion resistance is also superior to most steel alloys. While offering significant advantages, titanium is typically more expensive than other options. Its lightweight properties can be beneficial in applications where minimizing overall weight is critical.
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Other Materials & Coatings
While less frequent, other materials might be employed in specialized applications. Additionally, various coatings can enhance corrosion resistance or reduce friction. Phosphate coatings, for example, enhance corrosion resistance and lubricity on steel screws. Understanding the intended use and environmental conditions helps determine the most suitable material and coating.
Choosing the correct material for this critical component contributes significantly to the rifle’s safety, reliability, and longevity. Careful consideration of environmental factors and intended use ensures optimal performance and prevents potential issues arising from material degradation or failure. The material selection directly impacts the screw’s resistance to wear, corrosion, and mechanical stress, ultimately contributing to the overall integrity and functionality of the firearm.
3. Installation
Proper installation of the stock screw is paramount for the Mak 90 rifle’s safe and effective operation. Incorrect installation can lead to instability, inaccuracy, and potential damage to the firearm. This process requires attention to detail and adherence to specific procedures to ensure a secure and functional stock attachment.
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Preparation
Before installation, ensure the receiver and stock are clean and free of debris. Inspect the screw for any damage or defects. Having the correct tools, including a properly sized screwdriver or wrench, is essential to prevent damage during installation. Applying a small amount of gun grease to the screw threads can enhance lubricity and prevent galling.
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Alignment and Insertion
Carefully align the stock with the receiver and insert the screw through the designated holes. Ensure the screw engages smoothly with the threads in the receiver. Forcing the screw or cross-threading can permanently damage the receiver. Starting the screw by hand helps prevent cross-threading and ensures proper alignment before applying torque.
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Torque Application
Applying the correct torque is crucial for securing the stock without damaging the screw or receiver. Over-tightening can strip the threads or damage the stock, while under-tightening can result in a loose and unstable stock. Using a torque wrench helps ensure precise torque application. Consult the manufacturer’s specifications or relevant resources for the recommended torque value.
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Verification
After installation, verify the stock is securely attached and does not wobble. Inspect the screw head to ensure it is flush with the stock and not over-tightened. Function testing the rifle after installation confirms proper functionality and safety. Regularly inspecting the stock screw for tightness and signs of wear is essential for maintaining safe operation.
Meticulous attention to each of these installation steps ensures the stock is securely attached to the receiver, contributing to the rifle’s overall safety, accuracy, and reliability. Failure to adhere to these procedures can compromise the structural integrity of the firearm and potentially create hazardous conditions. Proper installation is therefore essential for maintaining the Mak 90’s functionality and ensuring its safe operation.
4. Torque
Appropriate torque application is crucial when securing the stock screw on a Mak 90 rifle. Incorrect torque can lead to a variety of issues, impacting the rifle’s safety, stability, and overall performance. Understanding the role of torque in this context requires consideration of several key factors.
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Appropriate Torque Values
Manufacturers often specify a recommended torque range for the stock screw. This specification considers factors like the screw material, receiver material, and desired clamping force. Applying torque outside the recommended range can lead to stripped threads, damaged screws, or a poorly secured stock. Consulting the rifle’s manual or contacting the manufacturer ensures the correct torque value is used.
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Torque Wrench Usage
A torque wrench provides a controlled and measurable method of applying torque. This tool allows for precise application within the specified range, minimizing the risk of over- or under-tightening. Using a properly calibrated torque wrench and the correct bit or socket size is essential for accurate and safe installation. Different types of torque wrenches exist, including beam-type, click-type, and digital, each offering varying levels of precision and ease of use.
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Consequences of Incorrect Torque
Over-tightening the stock screw can strip the receiver threads, damage the screw head, or even crack the stock. Under-tightening, conversely, can result in a loose stock, affecting accuracy and potentially creating a safety hazard. A loose stock can shift during firing, impacting the point of aim and potentially causing injury. Furthermore, excessive movement can damage the mating surfaces between the stock and receiver.
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Practical Application and Verification
When applying torque, it’s important to tighten the screw gradually and smoothly. Sudden or jerky movements can lead to inaccurate torque readings and potential damage. After tightening, visually inspect the screw head and surrounding area for any signs of damage or excessive deformation. Confirming stock stability by checking for any movement or play ensures proper installation. Regularly checking the stock screw for tightness during routine maintenance helps maintain safe and reliable operation.
Proper torque application is fundamental to the secure and stable attachment of the Mak 90’s stock. It directly influences the rifle’s accuracy, safety, and longevity. Adhering to manufacturer recommendations and utilizing appropriate tools, such as a torque wrench, ensures the stock remains securely attached and contributes to the rifles overall performance and safety. Neglecting these considerations can compromise the firearm’s integrity and create potentially dangerous conditions.
5. Replacement
Replacement of the Mak 90 stock screw is a crucial aspect of maintaining the rifle’s structural integrity and operational safety. Several factors necessitate replacement, ranging from normal wear and tear to damage caused by improper installation or use. Understanding these factors allows for proactive maintenance and prevents potential safety hazards.
Damage, often indicated by stripped threads, a deformed head, or visible cracks, necessitates immediate replacement. A damaged screw compromises the secure attachment of the stock, affecting accuracy and potentially creating dangerous conditions during firing. For instance, a stripped screw may loosen during firing, causing the stock to detach and resulting in loss of control. Wear, resulting from repeated use and environmental exposure, can also necessitate replacement. A worn screw may loosen over time, reducing the stability of the stock and impacting accuracy. Even in the absence of visible damage, periodic inspection and preventative replacement are advisable to ensure continued safe operation. Replacing a worn screw before it fails prevents potential malfunctions and maintains the rifle’s reliability.
Selecting the correct replacement screw requires careful consideration of dimensions, material, and finish. Using an incorrect screw can lead to further damage or create safety hazards. Consulting manufacturer specifications or seeking expert advice ensures the appropriate replacement is selected. Proper installation techniques, including the use of a torque wrench and adherence to recommended torque values, are essential for a secure and lasting replacement. Ultimately, understanding the factors that necessitate replacement and adhering to proper replacement procedures contribute significantly to the Mak 90’s longevity, reliability, and safe operation. Neglecting these considerations can compromise the firearm’s integrity and create potentially dangerous situations.
Frequently Asked Questions
This section addresses common inquiries regarding the Mak 90 stock screw, providing concise and informative responses to clarify potential uncertainties and promote proper handling and maintenance.
Question 1: Where can replacement stock screws be sourced?
Reputable firearms retailers, online marketplaces specializing in firearm parts, and gunsmiths often stock these specific components. Verifying the seller’s reputation and the screw’s compatibility with the Mak 90 is crucial.
Question 2: What are the potential consequences of using an incorrect screw?
An incorrect screw can damage the receiver, compromise stock stability, and affect accuracy. It can also create safety hazards due to potential stock detachment during firing.
Question 3: How often should the stock screw be checked?
Regular inspection, ideally before and after each use, is recommended. This ensures the screw remains properly tightened and free from damage.
Question 4: Can any type of threadlocker be used on the stock screw?
While threadlocker can help prevent loosening, using an excessively strong variant can make future removal difficult. A removable threadlocker specifically designed for firearms is recommended.
Question 5: What indicates a stock screw needs replacement?
Stripped or damaged threads, a deformed head, or visible cracks indicate the need for immediate replacement. Even without visible damage, periodic replacement as part of preventative maintenance is advisable.
Question 6: How can one determine the correct torque specification if the manufacturers documentation is unavailable?
Consulting a qualified gunsmith is highly recommended when manufacturer specifications are unavailable. They can determine the appropriate torque based on the screw and receiver materials.
Proper maintenance and understanding of the Mak 90 stock screw are crucial for the rifle’s safe and effective operation. Addressing these common inquiries contributes to responsible firearm ownership and promotes best practices for maintenance and repair.
Further sections will delve into advanced topics related to Mak 90 maintenance and customization.
Tips for Maintaining a Secure Stock
Maintaining a properly secured stock on a Makarov 90 rifle is crucial for safety and optimal performance. These tips offer practical guidance for ensuring the stock remains firmly attached and functions as intended.
Tip 1: Regular Inspection: Regularly inspect the fastener for any signs of wear, damage, or loosening. This should be part of routine maintenance and performed before and after each use. Look for stripped threads, a damaged head, or any visible cracks.
Tip 2: Proper Torque Application: Use a torque wrench to ensure the fastener is tightened to the manufacturer’s specified torque value. This prevents over-tightening, which can damage the receiver or stock, and under-tightening, which can lead to instability.
Tip 3: Correct Replacement Parts: If replacement becomes necessary, ensure the new fastener matches the original in terms of dimensions, material, and thread pitch. Using incorrect parts can compromise the rifle’s structural integrity.
Tip 4: Professional Consultation: If uncertainties arise regarding proper installation or replacement procedures, consult a qualified gunsmith. Professional guidance ensures the stock is securely and correctly attached.
Tip 5: Cleaning and Lubrication: Keep the area clean and lightly lubricated. This prevents the buildup of debris and corrosion, which can impede proper function and lead to premature wear.
Tip 6: Appropriate Tools: Always use the correct tools, including properly sized screwdrivers or wrenches, during installation or removal. Using incorrect tools can damage the fastener or the receiver.
Tip 7: Avoid Over-Tightening: Over-tightening can strip threads, damage the stock, and create unnecessary stress on the receiver. Adhering to the specified torque settings is crucial.
Adhering to these guidelines contributes significantly to the rifle’s safety, reliability, and longevity. A secure stock ensures consistent accuracy and safe operation, enhancing overall performance.
This information provides practical guidance for maintaining a secure and functional stock. The following conclusion summarizes the key takeaways and emphasizes the importance of proper maintenance.
Final Assessment
This exploration has detailed the critical role of the Mak 90 stock screw in ensuring the rifle’s structural integrity, safe operation, and overall performance. From material composition and dimensional specifications to proper installation procedures and torque application, each aspect contributes significantly to the secure attachment of the stock. Understanding these elements allows for informed decision-making regarding maintenance, replacement, and potential troubleshooting.
The seemingly small stock screw exemplifies the crucial role of each component in a complex system like a firearm. Careful attention to detail, adherence to proper procedures, and proactive maintenance practices contribute significantly to safe and responsible firearm ownership. Neglecting these seemingly minor details can have significant consequences, compromising both functionality and safety. Continued education and responsible practices are paramount for ensuring the safe and effective operation of the Mak 90 rifle.