The Best Magazine Extensions for SIG P320 (2020) – Comprehensive Review

Best Magazine Extensions for SIG P320

Feel like the OEM or stock magazine of your SIG Sauer P320 is not enough and want something more? Well, if that’s the case, you are in the right place. With so many choices of different size are available on the market, it is sometimes difficult to find the best SIG P320 magazine extensions, but before you look for the right one for your SIG P320, let’s have a look at how you choose the best SIG P320 magazine extension for your pistol.

How to Choose a SIG P320 Magazine Extension

By understanding how to choose the right magazine extension for your SIG P320, you can easily purchase a mag that suits you best.


Even though a magazine extension for your SIG P320 may not be a major upgrade, it is still ideal to have something affordable yet functional. As a customer, the quality of the mag should still be a priority over the price of the products. 


The quality of products will always be the top criteria no matter what parts you are looking for. A SIG P320 magazine extension that is built with good quality materials can last you very long and save money for you in the long term as well. 

Number of rounds

How many extra rounds you want for your SIG P320 will depend entirely on personal preference. Some people may find that one extra round is enough and some people may want up to five extra rounds for their SIG P320. At the end of the day, it still comes down to how many rounds you want in your gun. 

Now that you know the proper way to evaluate and choose the best magazine extension for your SIG P320, let’s have a look at some of the best SIG P320 magazine extensions on the market. 

Best SIG P320 Magazine Extensions Review

We put together a list of mags alongside certain specifications in the detailed reviews so you know if these magazines are suitable for your intended use.

1. HYVE Technologies SIG Sauer P320 Compact Magazine Extension


HYVE Technologies is a well-known gear expert for making high quality aftermarket firearm accessories. HYVE Technologies is also a specialized maker in making parts for famous gun brands like Glock, Ruger, Smith and Wesson and SIG Sauer. 

HYVE Technologies also aims to provide the best possible price for their customer. To be the leader in the industry, HYVE Technologies have implemented a cutting edge design for this SIG Sauer P320 Compact Magazine Extension.

The HYVE Technologies SIG Sauer P320 Compact Magazine Extension is available in two different models, one +3 and the other one is a +5 Mag Base Extension.  Both of these models are only compatible with the OEM 15 round and 17 round factory magazine. 

The HYVE Technologies SIG Sauer P320 Compact Magazine Extension is only a baseplate which means there are no springs or additional parts that makes the installation difficult. Users of the HYVE Technologies SIG Sauer P320 Compact Magazine Extension are satisfied with how easy it is to install this magazine extension into the magazine body. 

A difficulty that you might experience when installing this HYVE Technologies Magazine Extension is that the base pad may require a bit more effort to get it in place. But once you have installed the HYVE Technologies SIG Sauer P320 Compact Magazine Extension you can enjoy the extra rounds and firepower that you get from it. 

Bottom Line

For shooters out there that are looking for something that has a simple design and gives you a few extra rounds to fire, the HYVE Technologies Magazine Extension would be the best choice for you. It is also easy to install and can fit most of the pistols on the market. The overall build and quality of this HYVE Technologies Magazine Extension are also very good so you don’t have to worry about its durability.


  • Durable construction
  • Easy to install
  • Extends the magazine by few extra rounds
  • Fits most P320 pistols


  • None

2. Springer Precision SIG P320 140mm Base Pads w/Power Spring


Springer Precision is a manufacturer that focuses on making products of the highest quality as well as satisfying their customers. The products by Springer Precision are competition shooting accessories and are made by people with experience in competition shooting. The Springer Precision SIG P320 140mm Base Pads w/Power Spring is one of the best magazine extensions for the SIG P320. 

This magazine extension is CNC machined and made from aluminum with hard anodized finish. A construction like this ensures that this product has a long service life. With the hard anodized finish, this magazine extension can withstand abuse and will still be functional. 

Besides having a good quality build, this magazine extension wouldn’t cost you too much money but still be able to give you the firepower that you are looking for. Also, it is available in many different colors which gives you more options to select the color that you prefer. Although it is affordable, it is definitely not a poor quality product. 

This product is a good product to have for beginners and also for competitive shooters. The reason for that is because there is a hex driver that is included when you purchase this magazine extension to make installation and removal from the magazine body a breeze. It can save you a lot of time figuring out how to fit this unit to your magazine. 

With the use of the discrete set screw, it gives this magazine extension a simple backing as well as a solid attachment from the locking mechanism. Something that this product can be improved on is the spring that is used. Stronger springs would be better in terms of holding a few more rounds without jamming. 

Bottom Line

This magazine is a great product for people that are just starting out and for competition and target shooters. It is an affordable option that is available in various color choices and the material used is also high quality with good finishing. This product is also easy to install on your P320 pistol magazine body as well as other magazines that fit the specifications. 


  • Looks good on a pistol
  • Can fit on most magazines
  • Lower price compared to some magazine extensions
  • Requires little time to install
  • Durable construction


  • Slightly weak spring
  • Pad is not made with the best quality of materials

3. Taylor Freelance – SIG P320 +5 Base pad


Taylor Freelance believes that “More Ammo Is Always Better” and it is very true that having a few extra rounds more for your SIG P320 pistol can give you an advantage in competitive situations. Some people may say that you can’t have too many rounds but many of us may disagree with it. 

Unlike most base pads, his magazine extension by Taylor Freelance allows you to enjoy up to extra 6 rounds if your SIG P320 pistol is chambered for the 9mm round and extra 5 rounds for other calibers. However, it is slightly tight to fit 6 rounds of 9mm and it is definitely something that this product can improve on. 

The Taylor Freelance SIG Sauer P320 magazine extension is also one of those base pads that are easily installed. Which is why it is one of the best SIG P320 magazine extensions on the market. It also has custom springs and a quick-release locking plate and is a design that makes this magazine extension a good unit to purchase. 

There is also an updated floor plate design that this magazine extension has incorporated. The new floor plate design allows the floor plate to slide up into the frame easily which enhances the functionality of this item. 

Another feature that makes this item a good magazine extension for the SIG P320 is the aluminum construction that increases the service life of it. Some suggestions that are made for this magazine extension is to make it a universal style extender and not just chambered for rounds like the 9mm round and .45 round. 

Bottom Line

This magazine extension for the SIG Sauer gun model, SIG P320, is a very well built item that offers extra rounds for competitive shooters and for casual target shooters. It is also made to be easily installed which is what many shooters search for when looking through products that are available.   


  • Durable construction
  • Good floor plate design for better feeding
  • Easy to install
  • Fits calibers like 9mm round and .45 round
  • Suitable for many purposes for your pistol


  • Not suitable for all calibers

4. X-Grip SIG Sauer P320 Subcompact


X-Grip is a company that specializes in making mag adapters for compact and subcompact pistols like the SIG Sauer P320. This mag extension has been made to match the standards of the industry and can be of good use for the U.S military and professional shooters. It is designed to incorporate big magazines into the pistol’s grip to increase the number of rounds the pistol can fire.

This is a versatile magazine extension as it has a compact size but the capacity of a full-size magazine. It is also a good item to use when transitioning your pistol from a concealed carry to a pistol with good firepower. This SIG Sauer P320 magazine extension is compatible with the magazines that use 9mm round, .40 S&W and .357 SIG. 

This magazine extension also has an ergonomic design that blends in well with the gun itself by having the aesthetics of a classic SIG Sauer. It is also made to provide a good level of comfort and for users to have better control and accuracy. This magazine extension can also be installed easily by just sliding it over the OEM P320 magazine and no tools are required to get it done. 

The longevity of this magazine would not be a problem as well because it is made with top quality materials to ensure that this product is able to withstand harsh conditions. Which is why it is suitable for users to bring it along on target shooting trips, training as well as using it as backup mags. 

Bottom Line

If you are on the market to search for a SIG Sauer P320 magazine extension that is simple yet durable, the X-Grip magazine extension would be a great option for you. It has a simple installation method that is completely tool-free which can help to save a lot of time trying to fit it to the OEM magazine.


  • Easy installation
  • Gives a comfortable grip around the magazine
  • Fits calibers like 9mm and other common pistol calibers
  • High-quality construction


  • Does not extend as many rounds as other mag extensions

5. Killer Innovations SIG P320 +5 Magazine Extension


The Killer Innovations SIG P320 magazine extension is one of those products that give the users maximum grip and good control while feeding the mag. This is done with Killer Innovations’ “Enhanced Grip Feature” that has an aggressive serrated lip for the shooter to hold the pistol firmly under different conditions.

One thing that makes this a good magazine extension for many people is the color options that are offered. It is not limited to only one color or two but up to seven colors that you can choose from. In addition, as a customer, you will also appreciate the weight of this product as it is not too heavy or too light that it feels cheap.

Besides that, there won’t be any issues when it comes to the service life of this magazine extension. This is because of the T6 aluminum construction and anodized finish that ensures that it maintains its functionality and stay in service for a long time. It is also made for cleaning your mag easily by depressing the retaining pin and sliding the floorplate out. 

Bottom Line

This magazine extension offers color choices that are not commonly seen in other SIG Sauer P320 magazine extensions. It is also durable with the aluminum construction and gives an extra 5 rounds to your magazine. 


  • Strong aluminum construction
  • Compatible with most SIG P320 magazines
  • Offers many color options


  • Not compatible with 10 round mags

Conclusion – The Best Overall Mag Extension 

The best SIG Sauer P320 magazine extension from this list of magazines would be the HYVE Technologies SIG Sauer P320 Compact Magazine Extension. As you can tell from these reviews, this mag is one of those quality products made by a company whose name is well-known as a gear expert to many people. The  HYVE Technologies SIG Sauer P320 Compact Magazine Extension is also easy to install on the magazine body and suitable for many categories of user. 

Frequently Asked Questions (FAQ)

Q: How many rounds does the SIG P320 hold?

The standard ammo capacity of the SIG P320 is 15+1 round and with the use of a magazine extension, it can reach up to a 20-round capacity. 

Leave a Comment