The Ultimate Guide to How to Oil a Shotgun & Maintain Your Firearm

As someone who’s spent over a decade guiding hunting trips and exploring the backcountry, I’ve learned firsthand that a well-maintained firearm isn’t just about safety – it’s about reliability. Knowing how to oil a shotgun, and more broadly, how to clean a shotgun, is absolutely crucial for anyone who owns one, whether it’s a 12 gauge, 20 gauge, or an over-under. This guide will walk you through everything you need to know, from basic cleaning to proper lubrication, ensuring your shotgun is ready for anything the field throws your way. We'll cover everything from a simple 12 gauge shotgun cleaning to more complex tasks like cleaning an over under shotgun and even sig p365 cleaning and lubrication principles that apply across platforms.

Why Regular Shotgun Cleaning and Oiling Matters

Before we dive into the “how-to,” let’s talk about the “why.” A shotgun, like any mechanical device, accumulates fouling – residue from gunpowder, primer, and lead or steel shot – with each use. This fouling can lead to:

• Reduced Accuracy: Fouling interferes with the smooth operation of the action and the bore.
• Increased Wear and Tear: Abrasive fouling accelerates corrosion and damages internal components.
• Malfunctions: Severe fouling can cause jams, misfires, and other dangerous malfunctions.
• Corrosion: Moisture combined with fouling creates a corrosive environment, especially in humid climates.

Regular cleaning and oiling prevent these issues, extending the life of your shotgun and ensuring it functions reliably when you need it most. How often to clean a shotgun depends on usage; after every outing is ideal, but at least every few months for storage. The National Park Service emphasizes firearm safety, and proper maintenance is a key component of that.

Gathering Your Shotgun Cleaning Supplies

Having the right tools makes the job much easier. Here’s a checklist of what you’ll need:

• Cleaning Rod: Choose one made of coated steel or carbon fiber to avoid damaging the bore.
• Bore Brushes: Bronze or nylon brushes, sized to your shotgun’s gauge (12 gauge, 20 gauge, etc.).
• Jags: Used to push patches through the bore.
• Slotted Patch Holders: An alternative to jags for holding cleaning patches.
• Cleaning Patches: Cotton patches of the appropriate size.
• Solvent: A quality gun solvent designed to dissolve fouling.
• Gun Oil: A lubricating oil specifically formulated for firearms.
• Cleaning Rags: Soft, lint-free rags.
• Small Brushes: For scrubbing hard-to-reach areas.
• Gun Cleaning Mat: To protect your work surface.
• Safety Glasses & Gloves: Protect your eyes and skin from solvents.

You can find comprehensive cleaning kits at most sporting goods stores, like those recommended by REI Expert Advice.

Step-by-Step: How to Clean a 12 Gauge Shotgun (and Other Gauges)

The process is similar for most shotgun types, including how to clean a pump shotgun and how to clean your shotgun in general. I’ll focus on a 12 gauge, but the principles apply to other gauges as well.

1. Safety First!

Always ensure your shotgun is unloaded before beginning any cleaning. Remove the ammunition, double-check the chamber and magazine, and visually inspect the bore. Treat every firearm as if it is loaded.

2. Disassembly

Field strip your shotgun according to the manufacturer’s instructions. This typically involves removing the forend, barrel, and trigger group. Refer to your owner’s manual for specific disassembly procedures. For cleaning over under shotgun models, this will involve separating the barrels from the receiver.

3. Barrel Cleaning

This is the most important part. Here’s how to tackle shotgun barrel cleaning:

1. Apply Solvent: Wet a patch with solvent and run it through the bore several times.
2. Brush the Bore: Attach a bore brush to the cleaning rod and run it through the bore from breech to muzzle. Repeat several times.
3. Patching: Attach a jag or slotted patch holder to the cleaning rod and run clean patches through the bore until they come out clean.
4. Inspect: Visually inspect the bore for any remaining fouling. Repeat steps 1-3 if necessary.

4. Action and Receiver Cleaning

Use a small brush and solvent to scrub away fouling from the action, receiver, and other internal components. Pay attention to areas where carbon buildup is common. Wipe clean with a rag.

5. Lubrication: How to Oil a Shotgun

Proper lubrication is just as important as cleaning. Apply a thin coat of gun oil to all moving parts, including the action, trigger mechanism, and barrel exterior. Don’t over-oil; a little goes a long way. For an over under shotgun, pay special attention to the hinge points and locking lugs.

6. Reassembly

Reassemble your shotgun according to the manufacturer’s instructions. Ensure all parts are properly seated and functioning correctly.

Specific Considerations for Different Shotgun Types

While the general process is the same, some shotgun types require special attention.

Cleaning a Pump Shotgun

Pump shotguns, like the Remington 870, tend to accumulate fouling in the action due to the reciprocating pump mechanism. Pay extra attention to cleaning and lubricating the pump linkage and the receiver rails. Refer to the manufacturer’s guide for specific disassembly instructions.

Cleaning an Over Under Shotgun

Cleaning an over under shotgun requires careful disassembly and cleaning of both barrels. Ensure the barrels are properly aligned during reassembly. Inspect the hinge points and locking lugs for wear or damage.

Sig P365 Cleaning and Lubrication

While not a shotgun, the principles of firearm maintenance apply. The sig p365 cleaning and lubrication process focuses on the slide rails, barrel, and internal components. Follow Sig Sauer’s recommended cleaning procedures, which are readily available on their website. The key is to use a quality solvent and oil, and to apply lubrication sparingly.

Long-Term Storage and Maintenance

If you’re storing your shotgun for an extended period, take these extra steps:

• Thorough Cleaning: Clean and oil the shotgun thoroughly before storage.
• Protective Coating: Apply a protective coating of oil to all metal surfaces.
• Storage Location: Store the shotgun in a dry, secure location, away from extreme temperatures and humidity.
• Periodic Inspection: Inspect the shotgun periodically for signs of corrosion or damage.

The USDA Forest Service provides guidelines on safe firearm handling and storage in national forests.

Leave No Trace and Responsible Firearm Ownership

As outdoor enthusiasts, we have a responsibility to practice Leave No Trace principles. This includes properly disposing of cleaning solvents and patches, and respecting the environment. Responsible firearm ownership also means following all applicable laws and regulations. Learn more about Leave No Trace at Leave No Trace.

By following these steps, you can ensure your shotgun remains in top condition for years to come. Remember, a clean and well-oiled shotgun is a safe and reliable shotgun. Happy shooting!