Welcome! This comprehensive guide details the safe operation and maintenance of your Stack-On 18-gun cabinet, ensuring responsible firearm storage practices.
Understanding the Importance of a Gun Cabinet
Responsible gun ownership demands secure storage, and a gun cabinet like the Stack-On 18-gun model is a crucial component. Beyond legal requirements in many jurisdictions, a cabinet protects unauthorized access, particularly safeguarding children and preventing accidental discharges.
Storing firearms securely minimizes the risk of theft, which fuels illegal activity and contributes to gun violence. A robust cabinet deters potential intruders and provides a physical barrier against unauthorized removal.
Furthermore, proper storage protects firearms from damage caused by humidity, dust, and accidental impacts, preserving their functionality and value. Investing in a quality gun cabinet demonstrates a commitment to safety, responsibility, and the secure handling of firearms.
Scope of this Manual – What We’ll Cover
This manual provides a detailed walkthrough for your Stack-On 18-gun cabinet, from initial setup to long-term maintenance. We begin with unboxing and assembly, ensuring all components are correctly installed and the cabinet is positioned for optimal security.
You’ll find comprehensive explanations of the cabinet’s features – construction, locking mechanisms, and interior configurations – to maximize its utility. We’ll guide you through safe firearm loading/unloading procedures, shelf adjustments, and storage optimization.
Crucially, we dedicate sections to maintenance, including cleaning, lock care, and bolstering security through bolting. Finally, a troubleshooting section and FAQs address common issues, ensuring you can confidently operate and maintain your gun cabinet for years to come.

Unboxing and Initial Setup
Let’s begin! Carefully unpack your Stack-On cabinet, inspecting for shipping damage before proceeding with the straightforward assembly process.
Inventory Check – Ensuring All Parts are Present
Before assembly, a thorough inventory is crucial. Refer to the parts list included within the packaging. Carefully compare each component received against this list. You should find the cabinet body, shelves (quantity varies by model), barrel rests, door handle(s), locking mechanism components (keys, combination dial if applicable), mounting hardware (screws, bolts, anchors), and potentially, accessory pouches or organizers.
Verify quantities and inspect each part for any damage incurred during shipping. Note any missing or damaged items immediately and contact Stack-On customer support for replacements. Do not attempt assembly with incomplete or damaged parts, as this could compromise the cabinet’s structural integrity and security. A complete inventory now saves potential headaches later!
Placement Considerations – Location & Security
Selecting the right location is paramount for both convenience and security. Choose a room that’s relatively discreet and offers a degree of environmental control – avoiding excessive humidity or temperature fluctuations. Consider accessibility; you’ll need easy, but not too easy, access for authorized users.
Crucially, prioritize security. While the cabinet provides a deterrent, maximizing its effectiveness requires strategic placement. Ideally, position the cabinet against an interior wall with minimal exterior exposure. Bolting the cabinet to the floor and/or wall (hardware often included, see Maintenance section) is highly recommended to prevent removal. Avoid placing it near easily accessible windows or doors.
Assembly Instructions – Step-by-Step Guide
Step 1: Unpack all components and verify against the inventory list (see Unboxing section). Step 2: Attach the base to the cabinet body using the provided screws – ensure alignment before tightening fully. Step 3: Install the door hinges, carefully aligning them with the pre-drilled holes. Step 4: Mount the door, checking for smooth operation and proper closure.
Step 5: Insert shelves and barrel rests according to your desired configuration. Step 6: Attach the handle and locking mechanism, following the specific instructions for your model (key or combination lock). Step 7: Double-check all screws and connections for tightness. Important: Do not force any parts during assembly.

Features and Components
Explore the robust design and key elements of your Stack-On cabinet, built for secure firearm storage and offering customizable interior options.

Cabinet Construction & Materials
The Stack-On 18-gun cabinet is primarily constructed from 14-gauge steel, providing a solid and durable barrier against unauthorized access. This steel construction offers significant resistance to prying and drilling attempts. The cabinet’s exterior features a scratch-resistant powder coat finish, enhancing its longevity and aesthetic appeal.
Internally, heavy-duty shelving is also crafted from steel, capable of supporting the weight of numerous firearms and accessories. The backing is composed of a durable composite material, adding to the overall structural integrity. Reinforced welds at critical stress points further contribute to the cabinet’s robustness. Careful material selection ensures both security and long-term reliability for your valuable firearms.
Locking Mechanism – Types & Operation
Your Stack-On 18-gun cabinet is equipped with a multi-point locking system, typically featuring either a key lock or a combination lock, depending on the model. Key locks utilize a double-bitted key for enhanced security, requiring a specific key cut to operate. Combination locks employ a three or four-digit combination, offering keyless access.
To operate, fully close the cabinet door and rotate the locking bolt(s) until secure. For combination locks, dial in the correct sequence and pull the handle. Regularly test the locking mechanism to ensure smooth operation. Never lubricate the lock cylinder with oil, as this can attract dust and impede functionality. Keep your key or combination secure and confidential.
Interior Configuration – Shelves & Barrel Rests
The Stack-On 18-gun cabinet interior is designed for flexible firearm storage. Adjustable shelves allow customization to accommodate various gun sizes and accessories. Shelf supports easily snap into pre-drilled holes, enabling quick height adjustments. Barrel rests, typically made of durable plastic, securely hold rifles and shotguns, preventing them from sliding or falling.
Properly positioning barrel rests is crucial; ensure they support the weight of the firearm without stressing the barrel. Utilize all available shelf space for maximizing storage capacity, organizing ammunition and cleaning supplies on upper shelves. Regularly check shelf supports for secure placement and adjust as needed to maintain a stable interior configuration.

Operation and Usage
Safely accessing and storing firearms within your Stack-On cabinet requires adherence to proper procedures, prioritizing responsible gun handling at all times.
Loading and Unloading Firearms Safely
Prioritize safety above all else when handling firearms near or within the cabinet. Always ensure the firearm is unloaded and pointed in a safe direction before initiating any loading or unloading process. Double-check the chamber and magazine to confirm emptiness.
When loading, maintain control of the firearm and ammunition. Avoid rushing the process. Similarly, when unloading, carefully remove the magazine and clear the chamber.
Never load or unload a firearm inside the cabinet itself. Utilize a separate, well-lit, and secure workspace. Once the firearm is safely loaded or unloaded, then carefully place it within the cabinet, utilizing the barrel rests and shelf configurations appropriately. Remember to always follow the four rules of firearm safety.
Adjusting Shelves and Barrel Rests
Customizing the interior of your Stack-On cabinet is key to maximizing storage and accommodating various firearm sizes. The shelves are typically adjustable, often utilizing shelf pins that insert into pre-drilled holes. Carefully remove the shelf, reposition the pins to your desired height, and gently replace the shelf.
Barrel rests are also adjustable, allowing for secure positioning of rifles and shotguns. Loosen the securing hardware, reposition the rest to fit the firearm’s forend, and retighten.
Ensure all adjustments are secure before storing firearms. Avoid overcrowding shelves, and distribute weight evenly. Regularly check the stability of shelves and rests to prevent accidental shifting or falls.
Maximizing Storage Capacity
Efficiently utilizing the space within your Stack-On 18-gun cabinet requires thoughtful organization. Consider storing firearms vertically with barrel rests adjusted to fit, maximizing shelf height. Utilize the full depth of the cabinet, but avoid obstructing the locking mechanism.
Smaller firearms, like pistols, can be stored on shelves or in designated compartments. Accessories – magazines, cleaning kits, ammunition – can be stored in remaining space, but never alongside loaded firearms.
Prioritize safety over sheer quantity. Do not force more firearms into the cabinet than it is designed to hold. Proper spacing prevents scratches and ensures easy access when needed.

Maintenance and Security

Regular upkeep and robust security measures are crucial for preserving your Stack-On cabinet’s functionality and protecting your firearms effectively.
Cleaning and Lubrication
Maintaining a clean cabinet extends its lifespan and ensures smooth operation. Dust and debris can interfere with the locking mechanism and potentially damage firearm finishes. Regularly wipe down the interior and exterior surfaces with a soft, dry cloth.
For stubborn dirt, a mild detergent solution can be used, but ensure the cabinet is thoroughly dried afterward. Avoid abrasive cleaners, as they may scratch the finish.
Lubrication is key for the locking mechanism. Apply a silicone-based lubricant to the lock components – keyholes, tumblers, and hinges – every six months, or more frequently if you notice stiffness. Do not use oil-based lubricants, as they attract dust and can gum up the works. Proper cleaning and lubrication contribute significantly to the long-term reliability of your Stack-On gun cabinet.
Lock Maintenance – Key & Combination Locks
Keyed locks require occasional lubrication with a graphite-based powder or silicone spray – avoid oil! Insert and remove the key several times after lubrication to distribute it evenly. If a key becomes difficult to turn, do not force it; further lubrication or professional locksmith assistance may be needed.
Combination locks should be regularly checked for smooth operation. Rotate the dials and listen for any clicking or resistance. If the combination feels stiff, avoid excessive force. Keep the lock face clean and free of debris.
Never attempt to disassemble either lock type. If you experience persistent issues, contact a qualified locksmith specializing in gun safe/cabinet locks for repair or replacement. Maintaining your lock is paramount for security.
Security Best Practices – Bolting to the Floor/Wall
Anchoring your Stack-On cabinet is crucial for preventing theft and unauthorized access. Bolting to both the floor and a wall significantly increases security. Use the provided hardware, or upgrade to heavier-duty bolts appropriate for your floor/wall construction (concrete, wood studs, etc.).

Locate wall studs for secure attachment. If studs aren’t conveniently positioned, use appropriate wall anchors rated for the cabinet’s weight. Ensure the cabinet is level before drilling and fastening.
Conceal bolt heads where possible to deter tampering. Regularly inspect the mounting hardware to ensure it remains tight and secure. Remember, bolting is a deterrent, not a guarantee, but dramatically improves resistance to forced entry.

Troubleshooting & FAQs
Need help? This section addresses common issues and frequently asked questions regarding your Stack-On 18-gun cabinet, ensuring smooth operation and peace of mind.

Common Issues and Solutions
Lock Malfunction: If the lock isn’t engaging, first ensure the door is fully closed. Try lubricating the locking mechanism with a silicone-based lubricant – avoid oil. If a key is bent, a replacement is needed. For combination locks, double-check the entered sequence.
Door Alignment: Misaligned doors can hinder locking. Loosen the hinge screws slightly, adjust the door position, and retighten. Ensure nothing inside obstructs closure.
Shelf Instability: If shelves feel loose, verify they are correctly seated on the supports. Tighten any shelf support screws. Avoid overloading shelves beyond the stated weight capacity.
Rust Spots: Wipe down any rust spots with a dry cloth and apply a protective gun oil or silicone spray to prevent further corrosion. Maintain proper humidity control in the storage area.
Frequently Asked Questions
Q: Can I bolt this cabinet to the floor even if I rent? A: While bolting enhances security, check your lease agreement first. Damage may incur fees.
Q: What’s the best way to prevent rust inside the cabinet? A: Utilize desiccant packs to absorb moisture and regularly clean firearms with protective oils.
Q: Is this cabinet fire-resistant? A: This model offers limited fire protection. Consider a dedicated fire-resistant safe for optimal security.
Q: Can the shelves be removed completely? A: Yes, the shelves are adjustable and removable to accommodate different firearm sizes and configurations.
Q: Where can I find replacement keys? A: Contact Stack-On customer support with your cabinet’s serial number for key replacement options.