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The Ultimate Sig Sauer P320 Magazine Buying Guide
The Sig Sauer P320 was released at the SHOT show in 2014 and has become one of the most popular pistols globally.
Since then, multiple variants of the P320 have come about to cater to every shooter’s needs. No matter what you’re looking for, whether it be full-size combat-ready pistols or something to tuck under your shirt for the day ahead, there is a P320 with your name on it.
My what-used-to-be an M18. Unfinished.
Sig generously sends multiple magazines with each P320 pistol; however, replacements can be expensive. So, when you want (or need) to order a few spares, you must find magazines that will do the job without breaking the bank.
We’ll break them down into categories based on home defense, concealed carry, and the range. This is a practical list, so there won’t be any drum magazines in the concealed carry section. Each mag has a purpose and a why.
Defense (Home Defense/Personal Defense)
One of the many roles that the P320 excels at is defense. The 21-round magazine capacity gives you plenty of room for error and allows you to take on more than one target if need be.
When defending your home, you want to keep your pistol light and maneuverable to limit the risk of getting caught on something, so no drum mags here.
As with any other gun part, test your magazines multiple times before calling them ready for trouble. Whether they’re factory-made or not, anything can fail.
Best For All Defense Purposes
Why are we so happy when factories offer high-capacity magazines with their pistols? Because we don’t have to worry about aftermarket issues just to have the extra rounds ready. Sig Sauer hit it out of the park in this category.
You can expect to get one of the 21-round magazines from the factory. With the M18 I purchased, there were two. They do protrude a reasonable amount, but it takes the aesthetic of the pistol to another level. And they are pretty tough.
Spares can be pricey, but mine are still going strong after the 4,000 rounds I’ve put through them. The feed lips are made of stainless steel, showing no signs of corrosion even after suffering through the PNW rain.
Because it is a factory magazine and has survived all of the torture I’ve put it through, I wholeheartedly recommend the 21-round magazine for all things defense.
The 21-round magazine gets the job done.
Best Concealed Carry Magazine
Sig Sauer typically includes 17-round magazines with most of its P320 pistols. If you have one, you know how well it performs.
Like the 21-round magazine, the 17-rounder features steel magazine towers and feed lips that show no signs of failure after thousands of rounds. The magazine sits flush with the bottom of the pistol grip, so it won’t get in the way when you try to clear your garment.
Nor will it print on your shirt, which is one of the many reasons why the 17-round magazine takes my recommendation for the best concealed carry magazine. It’s designed and tested to work with your firearm flawlessly.
I like to err on the side of caution when my life depends on it, and I’m sure you would, too.
Another Factory Option
Anyone who owns the P320 Compact is familiar with these magazines—the same ones that were in your case when you opened it.
Like the 17-round magazine, this one sits flush with the bottom of your grip, limiting how much it shows when you carry it. Like the other factory magazines mentioned, this 15-rounder has a steel magazine tower with warp-proof reinforced feed lips – even after leaving these magazines loaded for over a year at a time, you’ll be fine.
These 15-round mags are exact replacements or spares for anyone running a compact Sig.
Other Than Factory
Before getting into this, I want to clarify that I am NOT saying that these magazines cannot be used for defense purposes.
These can work, too, but ONLY after you’ve put plenty of rounds through them to validate their reliability. Factory mags can fail, too, but I’ve seen more from the aftermarket side.
However, these have been seeing positive reviews and serve as a more cost-efficient option than their factory counterparts.
Compact Option
Magpul has produced magazines for the U.S. Military and many other military organizations worldwide for decades. Since 2002, if there has been combat, there has been Magpul.
The AMAG is the successor to the legendary PMAG, which every Glock and AR-15 owner has encountered at least once in their shooting career. The AMAG adds rigidity by replacing the standard polymer with stainless steel.
So, if you’re worried about cracking, which is rare with polymer magazines, the AMAG has you covered. Many shooters have approved of these magazines, having suffered no issues that a tap rack bang couldn’t fix. I agree with them.
So if you don’t want to spend the price for factory mags, the next best thing is a Magpul AMAG.
17 Round AMAG
The 17-round AMAG is similar to the 15-rounder in its build and performance, with the only difference being the extra two rounds. And, of course, this 17-round magazine was made for full-size pistols.
It will protrude in compact pistols but still perform just fine.
Range
21 Round Option
You guessed it. The 21-round AMAG is similar to the 15 and 17-round magazines but features an extended baseplate like the factory 21-round Sig Sauer magazine. It is meant for full-size P320s but will also seat and shoot out of compacts.
These AMAGs are reliable and get the job done for a far cheaper price than the factory. Replacements or spares like these deserve a spot in your safe.
Super Extended
Extended magazines are not the most practical, but when it’s range day, the extended mag is hard to beat.
These ETS magazines are transparent polymer, so you can see how many rounds you have left while turning the paper target into Swiss cheese. The feed lips have steel reinforcements, and the baseplates are compatible with Glock extensions.
Oh, there’s a 40-round version, by the way.
Drum Magazine
Forget everything you’ve ever heard about “high capacity magazines” because those are yesterday’s news.
ProMag is the go-to maker of drum mags for pistols. They’ve been at it long; the kinks have been worked out. Way back when you could only get a drum mag for a Glock, they were riddled with issues.
Thankfully, those times are over. These mags are made of high-strength polymer with steel mag springs, and the feel lips are reinforced with steel.
They’ve proven highly reliable with the Sig variants, and many favor them with Flux Raiders and other PCC conversion kits.
Conclusion
The Sig P320 is an excellent firearm despite the early issues. There are reasons why it was chosen by the military other than price. No matter what you want from a pistol, you can find it in the P320 lineup.
You can get extra fancy if you’d like. Source
These magazines are meant to back you up or give you hours of blasting time. When working with those extended mags and drums, having a speed loader does help. Trust me, your thumbs will thank you later.
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Be good and take care.
