Ruger AR-556 MPR Problems And Their Solutions

The Ruger ar-556 MPR is a multi-purpose rifle that’s incredibly versatile with many features that appeal to gun enthusiasts.

It is both lightweight and durable, with a free-floating handguard, a stainless steel barrel with a 1:8 twist rate, a two-stage trigger, quality pistol grp and an adjustable stock.

This gun is designed to meet the demands of both competitive shooting and everyday plinking needs.

Let’s delve into common problems that Ruger ar-556 MPR owners may experience and explore effective solutions to maintain the optimal condition of their rifle.

The most common problems include Feeding, Safety, Trigger Hard Pull, Bolt Carriers Stuck, Jamming Problems, failure to lock back slide, Magazine Release, and under gassing. 

By the end of this post, you’ll better understand what to look out for and how to fix any issues you may encounter.

Ruger AR-556 MPR Problems

Ruger ar-556 MPR Specs

Specification Details
Caliber 5.56 NATO / .223 Remington
Handguard Free-floating M-LOK with Picatinny rail
Barrel Length 18 inches
Barrel Twist 1:8″ RH
Trigger Single-stage, non-adjustable
Gas System Direct Impingement
Barrel Material Cold hammer-forged, 4140 chrome-moly steel
Weight 6.8 pounds
Buttstock Magpul MOE SL

Common Ruger AR-556 MPR Problems And Their Solutions

1. Feeding Problems

Feeding problems can be a frustrating experience for any gun owner. But have no fear; there are ways to troubleshoot and fix this issue.

There are various reasons behind feeding problems in firearms. The most common causes include magazine issues, ammunition problems, and improper maintenance.

A malfunctioning magazine can cause feeding issues, leading to cartridges getting stuck or misfeeding. While using low-quality ammunition or reloaded rounds can also lead to feeding problems.

And lastly, dirty or corroded equipment can cause a jammed or misfeeding gun.

To fix these issues, here are some steps you can take:

1. Check the magazine – Make sure the magazine is functioning correctly and free of debris. Take it apart, clean it, and clear out any dirt or grime buildup.

2. Inspect the ammunition – Ensure you use the correct caliber, good quality factory ammunition. Avoid using low-quality rounds or reloaded bullets.

3. Clean the gun – A dirty or corroded firearm can cause feeding problems. Disassemble and clean each part of your gun thoroughly.

4. Lubricate – Once clean, apply lubrication to the moving parts of your firearm. This ensures smooth operation and reduces the risk of jamming or misfeeding.

2. Safety Problems

One major safety issue that can occur with any firearm is accidental discharge. This can happen if the trigger is accidentally pulled or if there is a malfunction with the gun’s firing mechanism.

Another issue is improper handling and storage, which can lead to unauthorized access to the firearm, putting others at risk.

So, what can be done to address these safety issues? One solution is always to follow proper gun handling and storage procedures.

This means keeping firearms locked and out of reach of unauthorized individuals, and ensuring that anyone who handles the firearm is properly trained and understands how to use it safely.

Additionally, regularly inspecting your firearm for any signs of wear or malfunction is crucial to prevent any accidents.

If you notice any issues or suspect a problem, it’s best to take the firearm to a qualified gunsmith to have it inspected and repaired.

Bolt Open With The Empty Magazine

When it comes to the Ruger AR556, one recurring issue reported by users is the problem of leaving the bolt open with the empty magazine.

This problem arises with the stock magazines that come with the rifle. However, a solution to this problem can easily be implemented.

To fix the issue of the bolt staying open after the last round is fired, Ruger has included a device known as the bolt catcher in the package of their AR556. This device is designed to keep the bolt closed when the magazine is empty, ensuring smooth operation and preventing the bolt from staying open unnecessarily.

The standard variants of the Ruger AR-556, including the recoil spring, are specifically engineered to work in conjunction with the bolt catcher.

Using the bolt catcher and the standard GI magazines, users can effectively solve the problem of the bolt staying open with the empty mag.

One of the reasons why some users may have experienced complaints regarding the bolt staying open could be due to the use of different round magazines or fancy aftermarket accessories.

It is important to note that using non-standard components can potentially introduce unforeseen issues and affect the rifle’s functionality.

3. Trigger Problems

The presence of a trigger problem can significantly impact the performance and functionality of a firearm.

One particular issue that arises is a half-cocked trigger, which can disrupt the proper functioning of the weapon. Understanding this problem’s nature requires careful study of its cause and potential solutions.

Upon examination, it becomes clear that the cause of the half-cocked trigger is often attributed to a missing or improperly positioned pin that is responsible for holding the trigger in place.

This pin plays a vital role in maintaining the proper functionality of the trigger mechanism.

Additionally, the spring that facilitates the smooth operation of the trigger may also be weakened or out of place, contributing to the issue.

Fortunately, there are effective ways to address this trigger problem. Replacing the missing or faulty pin is a key solution that solves the issue of the half-cocked trigger.

Additionally, if a weak spring is identified, it is crucial to change it to ensure proper functionality and reliability. These measures help restore the trigger mechanism to its optimal state and resolve the problem at hand.

It is important to note that individuals facing this issue should not be afraid to tackle it head-on.

While a half-cocked trigger can be concerning, replacing the pin and addressing any spring-related concerns effectively resolves the problem.

Moreover, taking advantage of this coverage is highly recommended if the firearm is still under warranty.

In such cases, the best course of action is to send the firearm back to the manufacturer for repair or replacement.

This ensures that the problem is fixed by professionals who comprehensively understand the trigger problem and can provide the necessary solutions.

4. Bolt Carriers Stuck

One of the main causes of bolt carrier stuck is a dirty AR-15. When the rifle is not properly cleaned, the accumulation of dirt and debris can cause the carrier to stick.

Another reason could be an improperly lubricated bolt carrier. If it’s not well lubricated, the carrier can get stuck and cause shooting issues.

Thankfully, the solution to this problem is not difficult. Here are the step-by-step instructions on how to fix a bolt carrier stuck:

  1. Check to ensure the gun is unloaded to prevent any accidental injuries while working on it.
  2. Field strip the rifle to access the bolt carrier group. 
  3. Clean the carrier and bolt thoroughly with a good solvent to remove any dirt and debris that may be present. 
  4. After cleaning, lube the bolt carrier group with a good-quality lubricant. 
  5. Reassemble the rifle and rack the bolt to ensure it moves smoothly. 
  6. Test fire the rifle to ensure that the bolt carrier moves properly and there are no more issues with sticking. 

5. Multiple Shots Problem

The multiple shots problem, or burst firing, refers to firing more than one round with a single trigger pull and split brass. This problem is not only frustrating, but it also poses a safety risk.

There are several reasons a rifle might experience burst firing. Still, the main causes are trigger malfunction, faulty fire control group, lower receiver will tilt to one side later on, faulty spring, and a hammer wrongly installed.

To fix this problem, you must first identify the root cause. If it’s a trigger malfunction, check the trigger assembly and ensure that all the components are properly seated. Clean any dirt or debris from the trigger and ensure no cracks or damage.

If the issue is with a faulty fire control group, replace the group altogether. You can also try to polish or reset the trigger, but if the problem persists, then swapping out the group is often the safest solution.

A faulty spring could also cause multiple shots. Inspect the spring and ensure that it’s in good condition. If it’s worn or damaged, you’ll need to replace it.

Similarly, if the hammer is wrongly installed, it could cause premature discharge. Check the installation of the hammer and realign it correctly.

6. Jamming Problem

There are several main causes for jamming in firearms, including a buildup of residue or debris in the chamber, poor quality ammunition, and improper maintenance and cleaning.

It is important to regularly clean and maintain your firearm and use high-quality ammunition to reduce the risk of jamming.

If you do experience jamming while using your firearm, there are several steps you can take to fix it. The first and most important step is to ensure the firearm is unloaded and safety is engaged.

From there, you must disassemble the firearm and inspect the chamber and bore for any debris or residue. Use a soft cloth and cleaning solution to remove any buildup, taking care not to damage any parts.

Once the firearm is clean, you may consider using higher quality ammunition or adjusting your shooting technique to reduce the risk of jamming in the future.

Regularly cleaning and maintaining your firearm is crucial to keep it functioning properly and avoid the frustration of jamming during use.

6. Failure to Lock Back The Slide

The failure to lock back slide is an issue that some gun owners have faced, but effective solutions are available.

If you face this problem, it is essential to understand that certain factors can contribute to its occurrence.

In some cases, the failure to lock back slide may be caused by worn-out components such as the gas block screws or the bolt stop.

These parts can become loose over time or rounded off, affecting the bolt’s stroke and preventing it from locking back properly.

However, it is crucial to note that this issue is not limited to specific models; it can occur across various firearm brands.

To address this issue, it is recommended to take advantage of the warranty provided by the manufacturer.

If your gun is still under warranty, you can contact the customer care service and inquire about the process of sending it back for repair.

This ensures that the necessary actions are taken to fix the problem and restore the proper functionality of the firearm.

In some instances, the solution may involve replacing certain components. For example, replacing the gas block screws, trigger pin, or bolt stop with new ones can help prevent the failure to lock back slide.

Additionally, reinforcing the firearm with a stronger buffer spring can enhance its performance and reduce the likelihood of encountering this issue.

7. Magazine Release

It’s a crucial part of any firearm responsible for ejecting the magazine from the gun’s chamber.

However, sometimes it can malfunction, causing the magazine to release unexpectedly or preventing it from releasing altogether.

There can be several causes for magazine release issues. For instance, it might be due to a worn-out magazine release button or a faulty magazine catch.

In some cases, it could be because of the magazine itself being too tight or too loose.

Thankfully, fixing magazine release issues can be done with a few simple steps. Firstly, ensure that the firearm is unloaded and clear of any ammunition.

Next, check the magazine catch to see if it is damaged or worn out. If it is, replace it with a new one.

If the magazine release button is the issue, remove it from the firearm and inspect it for any damage or signs of wear. Clean it thoroughly, and replace it with a new part if necessary.

If a loose magazine causes the issue, try tightening it until it fits securely in the chamber.

Conversely, if the magazine is too tight, try loosening it until you can release it with the magazine release button.

8. Under Gassing

Are you experiencing reduced gas pressure in your rifle? If so, you might be dealing with under gassing.

This is a common issue that can occur for a variety of reasons, including a fault barrel, gas tube, or heavy bolt carrier.

We’ve got you covered if you’re wondering how to fix these issues. Here’s a step-by-step guide for addressing under gassing in your rifle.

The first step is verifying that you are experiencing reduced gas pressure.

This can be done by checking the ejection pattern and the distance the spent casings travel. If they are not ejecting properly or traveling less than the expected distance, you likely have under gassing.

Next, you should check the gas block and gas tube. Look for any leaks or malfunctions that could be causing a reduction in gas flow.

If you identify any issues, replace the malfunctioning part or tighten any loose connections.

You should also inspect your bolt carrier group (BCG). If you’re using a heavier-than-standard BCG, this could cause under gassing. Replacing it with a lighter BCG could solve the problem.

Alternatively, you may need to replace your fault barrel or upgrade your gas system to increase pressure.

3 Best Alternatives To Ruger ar-556 MPR

If you are looking for alternatives to the Ruger AR-556 MPR, we have researched and compiled a list of three options that might fit your needs.

Each of these alternatives comes with its unique features and capabilities, so it’s best to compare them to your exact requirements before making a final decision.

1. HK SL8-6.

First on our list is the HK SL8-6. This rifle is renowned for its accuracy and precision, thanks to its long-stroke piston system and its ergonomic design and carbon fiber polymer.

It has a slim profile that allows for easy handling and comes in a semi-automatic configuration.

Additionally, the HK SL8-6 has a Picatinny rail that allows for easy attachment of optics and other accessories.

2. FN SCAR 16S

Next on our list is the FN SCAR 16S. This rifle is widely known for its reliability and versatility and is widely used by military forces worldwide.

It features low recoil,  which makes it easy for shooters to maintain accuracy even in rapid-fire situations.

It also comes with a cold-hammer-forged with chrome lined chamber and bore

Additionally, the FN SCAR 16S has an adjustable gas regulator that allows users to easily switch between different types of ammunition.

Zastava ZPAPM90PS

Finally, we have the Zastava ZPAPM90PS, a Serbian-made rifle growing in popularity among gun enthusiasts.

It features a milled receiver that is designed to withstand intense stress, and its chrome-lined barrel ensures that the rifle remains accurate even after extended use.

It also comes with a foldable stock, which makes it easy to transport and store.

Frequently Asked Questions

What is the barrel length of the Ruger AR-556 MPR?

The barrel length is 18 inches.

What is a Ruger AR-556 MPR?

The Ruger AR-556 MPR is a semi-auto rifle manufactured by Ruger. MPR stands for Multi-Purpose Rifle, indicating its durability, versatility for various shooting applications. It comes with a direct-impingement and rifle-length gas system.

One of the most costly rifles on the market comes with a detachable 30-round magazine, adjustable sights, and a threaded barrel for attaching muzzle devices.

What is the maximum range of the Ruger 556 MPR?

500 yards.

What type of magazine is compatible with the Ruger AR-556 MPR?

It compatible with standard AR-15 magazines.

Can I attach a suppressor to the Ruger AR-556 MPR?

Yes, it has a threaded barrel by which you can attach a suppressor.

What type of ammo can I use in my Ruger ar-556 MPR?

It is designed to use a .223 Remington/5.56 NATO chamber.

Does the Ruger AR-556 MPR have a collapsible stock?

Yes, the Ruger AR-556 MPR features a collapsible Magpul MOE stock.


Ruger AR 556 mpr is one of the most popular rifle among many shooters. But ihas some common problems that we have listed above.

Follow the instructions and fix the issues in order to use the rifle smoothly.

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