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If you’re a proud owner of a SIG Sauer MCX, you’ll know it’s a firearm that demands respect and care. Keeping it clean isn’t just about aesthetics; it’s about ensuring its functionality and longevity.

In this article, I’ll guide you step-by-step on how to clean your SIG Sauer MCX properly. From disassembling to cleaning and reassembling, we’ll cover it all.

Whether you’re a seasoned gun enthusiast or a novice, you’ll find this guide helpful. So, let’s get those cleaning kits ready and give your SIG Sauer MCX the care it deserves.

Step 1: Gather the Necessary Cleaning Supplies

You might be eager to get your hands dirty, but let’s keep in mind that preparation is key. Efficient and thorough firearm maintenance hinges on having the right set of cleaning supplies. So, before we dive into the nitty-gritty of cleaning your SIG Sauer MCX, let’s ensure you’ve gathered all the necessary tools and equipment. This step is crucial for both seasoned gun enthusiasts and novices.

First and foremost, you’ll need a quality gun cleaning kit. For a SIG Sauer MCX, it’s best to go for a universal type. These types of kits usually come packed with all the essentials. From cleaning patches and rods to bore brushes and lubricating oil – they’ve got you covered.

Next in line, you’d want to grab some cotton swabs. They’re handy for reaching those hard-to-access spots. Be sure to have a clean, lint-free cloth as well. You’ll be surprised by how much grime and residue it can suck in.

You also can’t overlook the importance of gun cleaning solvents. These are specially formulated to quickly break down carbon fouling and other residues, safeguarding your firearm’s efficiency and longevity. Be mindful to select solvents suitable for a SIG Sauer MCX, ensuring it’s not too aggressive to harm your weapon but potent enough to do the job.

Lastly, protective gloves and a well-ventilated working area are crucial. Cleaning a firearm isn’t just about keeping the gun in top shape. It’s also about keeping you safe and healthy.

And there you have it! Once you’ve all these supplies at hand, you’re geared up to begin the cleansing process. The next steps will guide you through disassembling and cleaning various components of your SIG Sauer MCX. Trust me, with all the right tools, it’s going to be a smooth ride. So gather up, and let’s charge ahead on this maintenance journey.

Step 2: Unload the SIG Sauer MCX and Make It Safe

The second step in the cleaning process is crucial – it’s about safety. Always keep in mind that a safe gun means a safe handler and environment. Let’s proceed to unloading your SIG Sauer MCX and make it safe.

Firstly, point the firearm in a safe direction where no damage can occur in case of a discharge. From my personal experience, it’s efficient to make a strict routine of this. It’s a small step but a crucial one for safety.

Then, remove the magazine. It’s the rectangular box located at the bottom of the gun. Simply press the release button, usually found on the side of the gun, and pull it out.

Now you can lock the bolt to the rear. This makes the inspection of the firearm’s chamber, a crucial part of safety, possible. I usually use my right hand’s thumb and forefinger to hold the charging handle and pull it to the back until the bolt is locked.

Here’s the vital part – checking the chamber. It’s essential to verify whether it’s loaded or not. Remember that seeing is believing. Never just feel or guess. Arrange good lighting and visually inspect the chamber to confirm it’s empty.

Lastly, let the bolt go forward. Don’t forget to place your SIG Sauer MCX on the safety mode by flipping its safety selector to the ‘safe’ position. This generally is located on the side of the gun, and when it’s on safe, no firing of the firearm can occur.

Undoubtedly, ensuring the firearm is safe before cleaning isn’t only a matter of compliance with the gun handling rules. It’s also a matter of personal and public safety. Following these steps makes the difference between proper maintenance and potential disaster. So, always be cautious: even an unloaded gun is still a gun.

Now that we’ve made sure the firearm is safe, we can proceed to the next stage of the cleaning operation. Bear in mind that all these precautions pave the way for a more convenient and efficient cleaning process.

Step 3: Disassemble the SIG Sauer MCX

After ensuring that your SIG Sauer MCX is safe to handle, we’ll move on to the next critical step – disassembly. This process isn’t as daunting as it sounds, I assure you. Your SIG MCX’s design actually makes disassembly a breeze even for novice gun owners.

The first step in disassembly involves removing the rear takedown pin. It’s a large, circular pin located near the back of the firearm. To remove it, push it from the left side and then pull it out from the right. This detaches the upper assembly from the lower one.

Next, we’ll remove the charging handle and bolt carrier group. Grasp the charging handle, pull it straight back, and then lift it away from the firearm along with the bolt carrier group that comes with it.

At this point, your MCX firearm is partially disassembled. Regardless of your comfort level or expertise, getting this far in the disassembly is a win. However, for a truly thorough cleaning, I recommend proceeding further.

To continue with the process, we separate the recoil assembly. Pull it back towards the rear of the firearm and lift – it’ll come right out.

Now! Always remember to keep each part in a safe location as you remove them. I usually use a large tray or container – it reduces the risk of losing smaller parts.

After completing these steps, your SIG Sauer MCX effectively stands disassembled, ready for a detailed clean-up.

Remember, although this sounds complex, it’s all about practice. Just as you practice shooting for precision, practice disassembly for efficiency. It might look like a long series of steps now, but I have faith that you’ll be disassembling your SIG Sauer MCX with ease and confidence in no time.

Last but not the least, let’s not rush. Disassembly, like shooting, must be done calmly and mindfully. Few tasks benefit from a rush job – and gun maintenance certainly isn’t one of them.

Step 4: Clean the Barrel and Chamber

Having disassembled the SIG Sauer MCX, we’re now ready to dig in and start the actual cleaning process. Specifically, we’ll start with the barrel and chamber. Dirty barrels can compromise accuracy, and a clogged or dirty chamber can cause difficulties in loading and firing.

For this step, you’ll need a bore snake or a cleaning rod, a chamber brush, and a cleaning patch. It’s important to stress that the use of high-quality, firearms-specific cleaning products is crucial. Generic or lower-quality products may not deliver satisfactory results and may potentially damage your firearm.

Begin by applying your cleaning solvent to your bore snake or cleaning rod with a brush attached. Send it down the barrel from the chamber end to the muzzle. You want to follow the same path the bullet takes when the firearm is discharged. This will help ensure that any debris or deposits are effectively removed.

Next, swap out your brush head for the cleaning patches. Soak the patches in solvent then run them through the barrel until they come out clean. This process may take several passes so a little patience is key. At this point, the barrel should be looking shiny and clean, but our mission to a perfectly cleaned SIG Sauer MCX doesn’t end here.

Following the barrel and chamber, the next section will cover cleaning the bolt carrier group, a critical component particularly susceptible to dirt build-up. We’ll address how to thoroughly clean and maintain this often-overlooked piece of your firearm. Remember to keep all removed parts safe and to hand, as they will be needed for reassembly once the cleaning is complete.

So far, you’ve done great in following this guide step-by-step. Moving forward, bear in mind how critical each step is in extending the life and preserving the functionality of your SIG Sauer MCX.

Step 5: Clean the Upper and Lower Receivers

Taking our learning forward from the last step, cleaning the upper and lower receivers of your SIG Sauer MCX is as vital as any other stage in this process. High-quality cleaning products ensure that not just the barrel and chamber, but the receivers are also well-maintained, prolonging the life and functionality of your firearm.

First, let’s discuss the upper receiver. Remember, keeping the removed parts safe is crucial, and this step is no exception. Grab your cleaning rag and some gun cleaning solution. Gently wipe down all parts, focusing particularly on areas with visible carbon build-up.

A chamber brush does wonders for cleaning the bolt carrier group. Use it to clean and scrub off any carbon or rust that could cause your firearm to malfunction. Remember, a well-maintained firearm is a reliable firearm.

Onto the lower receiver. This part of the gun may not seem as crucial, but it plays a fundamental role in the overall performance and life of your SIG Sauer MCX. Using your cleaning rag and solution, wipe down all areas of the lower receiver. Make sure not to overlook any notches as they can also accumulate dust and grit, which can negatively affect firearm’s performance.

You may also want to use a pick to reach tricky corners that your rag might’ve missed.

When it comes to maintaining your SIG Sauer MCX, never underestimate the importance of regular and thorough cleaning. This step, along with the preceding ones, is an integral part of the process. So, as we have seen, each bit plays a critical role in preserving the functionality of your firearm, be it the barrel, the chamber, or the upper and lower receivers. Now that we’ve gone over the cleaning process for these parts, you’re well on your way to ensuring the longevity of your SIG Sauer MCX.

Step 6: Clean the Bolt Carrier Group

Moving on to the next focal point of the SIG Sauer MCX maintenance routine. The Bolt Carrier Group (BCG). Get ready to delve into every crevice and ensure the longevity and functionality of your firearm.

Most of the accumulated dirt and residue can be found in the BCG. It’s here that accuracy and reliability are born. Keeping this particular group in tip-top shape is not something to underestimate or overlook.

Gathering Tools and Prepping

Firstly, assemble your necessary tools for the task at hand

  • A quality gun cleaning solution
  • A firm wire brush
  • Cleaning rags and patches
  • A small pick or dental tool

Once your tools are laid out, we’ll begin with fully disassembling the BCG. I always find it simpler to manage smaller pieces when it comes to meticulous cleaning.

Engage in Cleaning

Saturate your brush with the cleaning solution. Now, scrub all elements of the BCG with vigor. Pay particular attention to the bolt itself and the bolt carrier. They are prone to the most gunk build-up. Remember, we’re not just cleaning for aesthetics. We’re removing any potential obstacles to a smooth and precise shooting experience.

Utilize the small pick or dental tool to rid the extractor and other small spaces of any stubborn debris. They may seem insignificant but every particle counts when it comes to a precision instrument like the SIG Sauer MCX.

Drying and Inspection

Once satisfied with the cleaning, proceed to dry all components using your cleaning rags. Inspect each piece meticulously. Look for any signs of wear or damage. Over time, high-stress parts may need replacement to maintain optimal functionality.

Now that step 6 is taken care of, you can see why BCG cleaning is a crucial aspect of gun maintenance. Adequate attention to detail can noticeably enhance your firearm’s performance, prolong its lifespan, and ensure your safety.

Ready for more? Let’s continue this journey of maintenance and grasp every facet of ensuring the optimal performance of our SIG Sauer MCX. There’s plenty more to explore.

Step 7: Lubricate the SIG Sauer MCX

After the Bolt Carrier Group (BCG) is clean and inspected, the next offset in your cleaning venture is lubrication. Truly it’s a vital step, playing a chief role in extending the life of your firearm, and boosting its performance. The SIG Sauer MCX, like any high-performance piece of gear, craves the right lubrication to maintain its superior functionality. Let’s dive into that.

Begin with the BCG. Besides its myriad other functions, your BCG absorbs a good chunk of the recoil and buffer. Applying a thin coating of high-quality firearm lubricant on the exterior component of the BCG significantly reduces friction during use. Lubrication points to remember about your BCG:

  • Cam Pin – This tiny component takes a beating. It’s pivotal. So don’t forget to apply a few drops on it.
  • Bolt Assembly – Moving parts create friction. Tackle this by applying lubricant on the sides of the bolt where it makes contact with the inside of the BCG.
  • Firing Pin – While this component is not a high friction area, a single drop of oil ensures smooth operation.

Brush a bit of lubricant on the charging handle racks as well. Why? The charging handle interacts directly with the BCG, hence, essential to keep its path slick for superior performance.

Moving on, slide back to the upper receiver, dust cover, and forward-assist. Perform a swift wipe-down with lube. Light coating on these areas provides protection against corrosion and keeps the MCX running smoothly.

The beauty of the SIG Sauer MCX shines at its peak when well-lubed, ensuring its gears are in motion. Remember, quality over quantity is the lubrication motto. A hint of the right product at the right place does wonders.

The wheel of the SIG Sauer MCX cleaning is still in motion. With your firearm now primed and lubricated, we’re ready to carry on to the next step.

Step 8: Reassemble the SIG Sauer MCX

With the firearm deeply cleaned and properly lubricated, we’re ready to move on to the reassembly process. This crucial stage demands precision and attention to detail. Piecing together a SIG Sauer MCX accurately ensures safer and smoother operation in your future firearm experience.

Firstly, let’s focus on the Bolt Carrier Group (BCG). It’s essential to verify that all smaller components within the BCG are securely and properly placed. Take the bolt, cam pin, bolt carrier, and firing pin; they should be reinstalled sequentially and positioned correctly.

Bring out the upper receiver and position it face up, then place your BCG (with the bolt head facing forward) back into its cavity inside the upper receiver. Carefully slide the Charging Handle into its track at the top of the receiver. Align the lugs on the Charging Handle with the slots in the receiver. Once it’s in place, insert the BCG into the Charging Handle and push them both forward until secured.

Second, shift your attention to the lower receiver. Fix the trigger guard back into place. If you’ve removed your pistol grip for deep cleaning, now’s the time to fix it back. Slot the spring and detent back into the receiver before screwing the grip back tightly.

Don’t forget about your handguard. Align it with the top rail of your SIG Sauer MCX, then carefully slide it back into place. Lock it in by replacing and securing the bolts with your Allen wrench.

Finally, prepare to mate the upper and lower receivers. Close the dust cover on the upper receiver. Hold your lower receiver bottom-side up, position the upper receiver’s pivot holes with the lower’s pivot pins – then push the pins back in securely. The two major parts should connect smoothly.

Reassembling a SIG Sauer MCX can seem daunting. But as long as you remember where each part fits and ensure proper alignment, you’re good to go. With the SIG Sauer MCX now completely reassembled, we can proceed to the next stage of our firearm care routine.


We’ve journeyed through the process of cleaning a SIG Sauer MCX together. It’s evident that proper cleaning and maintenance are key to your firearm’s performance and lifespan. We’ve dissected the steps, focusing on the intricate task of reassembling your firearm. Remember, precision and attention to detail are your best friends during reassembly. They’ll ensure the safe and smooth operation of your SIG Sauer MCX. Now that you’ve got a clean, well-assembled firearm, you’re all set for the next phase of your firearm care routine. It’s my hope that you’ll apply these insights to maintain your SIG Sauer MCX in top-notch condition. Happy cleaning!

Frequently Asked Questions

Q: Why is it important to properly clean and maintain a SIG Sauer MCX firearm?

A: Proper cleaning and maintenance ensure the functionality and longevity of the firearm, reducing the risk of malfunctions and extending its lifespan.

Q: What is the eighth step of cleaning a SIG Sauer MCX?

A: The eighth step is reassembling the firearm after cleaning.

Q: How do you reassemble the Bolt Carrier Group (BCG) of a SIG Sauer MCX?

A: To reassemble the BCG, insert the bolt carrier into the upper receiver, aligning the key and cam pin, and then slide in the charging handle.

Q: How do you reassemble the upper receiver, lower receiver, and handguard of a SIG Sauer MCX?

A: To reassemble, connect the upper and lower receivers by pushing the takedown pins into place, then slide the handguard back onto the barrel and tighten any screws or locking mechanisms.

Q: Why is precision and attention to detail important during the reassembly process?

A: Precision and attention to detail ensure that all components are properly aligned and secured, preventing any safety hazards or malfunctions during the firearm’s operation.

Q: What can be done after the SIG Sauer MCX is completely reassembled?

A: Once reassembled, the next stage of the firearm care routine can be carried out, such as oiling the necessary parts and conducting function checks.