Understanding the Remington 870 Firing Pin
Anatomy of the Firing Pin
At its core, the Remington 870 firing pin is a relatively simple, yet precisely engineered component. It’s typically a rod-shaped piece of hardened steel. This steel is carefully selected for its ability to withstand repeated impacts and resist wear. The shape itself is critical. One end is generally blunt or slightly rounded, designed to strike the primer of the shotshell with sufficient force. The other end often features a small groove or a rounded tip designed to capture the firing pin spring and the retaining pin.
Crucial to the operation is the retaining pin. This small, often cylindrical pin is inserted through a hole in the bolt, securing the firing pin and preventing it from moving forward prematurely. Without it, the firing pin would be free to fly out, rendering the shotgun inoperable.
Finally, the firing pin spring plays a vital role. This spring is housed within the bolt, compressed between the firing pin and the bolt’s body. It provides the necessary force to drive the firing pin forward with enough impact to ignite the primer. The spring’s strength directly impacts the reliability of the ignition. A properly functioning spring is vital for ensuring the shotgun functions effectively.
Function of the Firing Pin
The Remington 870 firing pin is the final piece of the puzzle in the firing sequence. When the trigger is pulled, the hammer, driven by the mainspring, strikes the rear of the firing pin. This impact drives the firing pin forward, pushing it through the bolt face.
As the firing pin moves forward, its tip strikes the primer of the shotshell, which is seated in the chamber. The impact ignites the priming compound within the primer. The resulting flame then initiates the main propellant charge inside the shotshell, propelling the shot and wad down the barrel.
The velocity and impact of the firing pin are critically important. Too little force, and the primer may not ignite. Too much force (though less likely) could potentially damage the primer or, in rare cases, lead to a premature firing. The design of the firing pin and its interaction with the hammer and the spring is carefully calibrated to deliver the precise amount of impact needed for reliable ignition. The correct dimensions of the Remington 870 firing pin ensures consistent ignition of the ammunition.
Common Issues with the Remington 870 Firing Pin
Failure to Fire
One of the most frustrating problems is a failure to fire. When you pull the trigger, but nothing happens. This is a classic sign of a Remington 870 firing pin issue. Several factors can contribute to this.
A dull or worn firing pin tip is a primary culprit. Over time, repeated impacts can gradually deform or wear down the tip. This reduces the impact area, making it less likely to ignite the primer reliably. Insufficient spring pressure is another likely cause. A weakened or broken firing pin spring will not generate enough force to strike the primer effectively. An obstruction in the firing pin channel can also prevent the firing pin from moving freely. Debris, such as carbon buildup or small pieces of debris, can restrict its movement. Finally, the problem might not even be with the firing pin. Defective or hard primers can be resistant to ignition.
Troubleshooting this issue starts with a visual inspection. Carefully examine the firing pin tip for any signs of wear or damage. Next, check the firing pin spring. If it’s weak, worn, or broken, replace it. Cleaning the firing pin channel is critical to removing potential obstructions. If you are certain that the problem is with the ammunition, a different brand or type of shotshells may be the solution.
Light Primer Strikes
A light primer strike is when the firing pin impacts the primer, but the indentation is too shallow to ignite the primer. This is similar to a failure to fire, but the damage is more subtle.
Causes can include a weak firing pin spring, causing insufficient impact force. Binding within the firing pin channel can also restrict its movement, reducing its velocity. Finally, a damaged firing pin, particularly one that is chipped or bent, can also cause light strikes.
Troubleshooting often involves replacing the spring, cleaning the channel, and inspecting the firing pin for damage.
Firing Pin Breakage
Firing pins can, and sometimes do, break. This is less common than other issues but can happen. Repeated impact and wear and tear are often the root causes. Dry firing the shotgun (firing without ammunition in the chamber) can accelerate wear on the Remington 870 firing pin and cause it to fail.
A broken firing pin will almost always lead to a failure to fire. You might also hear an unusual sound when the trigger is pulled, or you might notice an altered recoil from the shotshell.
Other Issues
While less common, rust and corrosion can affect the firing pin and its channel, causing binding and potentially affecting its function. Debris, such as unburnt powder or carbon, can also build up, restricting movement. Regular maintenance is essential in preventing these problems.
Troubleshooting and Maintenance
Cleaning the Firing Pin Channel
Cleaning the firing pin channel is a straightforward process but critical to the proper function of your shotgun. You will need a cleaning solvent appropriate for firearms, a cleaning rod or brush, and pipe cleaners or cotton swabs.
Disassemble the bolt according to your shotgun’s manual. Spray the cleaning solvent into the firing pin channel, letting it dwell for a few minutes to loosen any debris. Then, use a brush or the cleaning rod with the cleaning tip attached to scrub the channel. Finally, use pipe cleaners or cotton swabs to remove any remaining debris and solvent. After cleaning, make sure to wipe the channel completely dry before reassembly.
Inspecting the Firing Pin
A visual inspection is a critical step in maintaining your Remington 870 firing pin. Carefully examine the firing pin for any signs of wear, damage, or deformation. Check the firing pin tip for any signs of chipping, flattening, or rounding. Look for any signs of corrosion or rust.
It’s important to handle the firing pin with care. Always ensure the shotgun is unloaded and the bolt is safely disassembled before handling the firing pin. Wear appropriate safety glasses and gloves to prevent injury or contamination.
Testing the Firing Pin
After cleaning and inspection, it is essential to test the firing pin’s function. After reassembling the bolt, load a dummy round or snap cap into the chamber. Then, pull the trigger. The firing pin should strike the primer of the dummy round with enough force to leave a clear and centered indentation. The indentation should be uniform and the primer should not be punctured. If you don’t have snap caps you can test the pin by pushing the pin by hand to see if it is striking the inside of the bolt face. If the firing pin is working properly, the shotgun should now be ready to fire.
Preventative Maintenance Tips
Regular lubrication is important for a smoothly functioning firearm. Apply a small amount of high-quality gun oil to the firing pin channel and the firing pin itself. This will help to reduce friction and prevent rust. The firing pin spring should be replaced according to the manufacturer’s recommendations. Avoid dry firing your Remington 870 unnecessarily.
Replacing the Remington 870 Firing Pin
Gathering Necessary Tools and Parts
Before you begin, gather the necessary tools and parts. You will need a new firing pin, a new firing pin spring, and a new retaining pin. It’s always a good idea to have these on hand. You will also need a punch set (specifically a roll pin punch is ideal for the retaining pin) a hammer, and safety glasses. Ensure that you have all the required components before starting the project.
Step-by-Step Replacement Procedure
Safety first! Unload your shotgun and double-check that the chamber is empty. Then, following these steps:
Unload and Prepare: Ensure the shotgun is completely unloaded and pointed in a safe direction. Remove the barrel and fore-end. Open the action and visually inspect the chamber to confirm it’s empty.
Field Strip: Follow the Remington 870’s field stripping instructions to disassemble the bolt from the receiver. This usually involves removing the bolt from the slide bars.
Remove the Retaining Pin: Use the roll pin punch and hammer to carefully remove the retaining pin. Place the shotgun bolt on a stable surface and position the punch on the retaining pin. Gently tap the punch with the hammer to push the pin out.
Remove the Old Firing Pin and Spring: Once the retaining pin is removed, the firing pin and spring should slide out of the bolt. Be careful, as the spring may be under some tension. Note the orientation of the firing pin and spring for reassembly.
Install the New Firing Pin and Spring: Insert the new firing pin and spring into the bolt in the correct orientation. Make sure that the rear of the firing pin aligns with the hole for the retaining pin.
Reinstall the Retaining Pin: Carefully align the holes in the bolt and the firing pin. Use the roll pin punch and hammer to gently tap the new retaining pin back into place. Make sure the pin is flush with the surface of the bolt.
Reassemble the Shotgun: Reassemble the bolt into the receiver and return the barrel and fore-end.
Function Test: After reassembly, perform a function test. Use snap caps to test the firing pin.
Safety Considerations During Replacement
Always wear safety glasses throughout the replacement process to protect your eyes from potential debris. Work in a well-lit area and on a clean surface. If you are unsure about any step of the process, consult a qualified gunsmith. Before reassembling your shotgun, make sure the firing pin is installed correctly.
Choosing a Replacement Firing Pin
OEM Versus Aftermarket
The most common choice is between an original equipment manufacturer (OEM) firing pin and an aftermarket firing pin. OEM firing pins are made by Remington or a licensed supplier, guaranteeing a perfect fit and function. Aftermarket firing pins are made by other manufacturers, which may offer similar quality or features.
Material Considerations
Most firing pins are made of hardened steel, but there may be variations. Some aftermarket pins may be made from stainless steel, which is more resistant to corrosion.
Reliable Brands
When selecting an aftermarket firing pin, choose a reputable brand with a proven track record. Research reviews and look for manufacturers known for their quality and reliability.
