The Cali legal 20 round mag

Bottom line: By putting two 10 round mags together you can have 20 rounds ready to go with minimal reload time.

I was recently asked by the good folks at Cross Industries if I would be interested in reviewing their new 10/10 Cross Mag for them. Naturally I said yes and so here we are. While they were kind enough to send me a few demo units for free, this article is the blunt honest opinion of CG&P.

The concept of attaching 2 mags together has been around for a while. The goal is to reduce the amount of movement (and by extension amount of time) it takes to reload the gun. By having two or more mags connected we can also reduce the amount gear that needs to be strapped to our body without reducing the amount of ammo in the load out config. The benefits of such a config are fairly obvious with little to no downsides.

The typical method of coupling AR mags is to put a device in the middle of the magazine and join the 2 mags in a side by side config. This is (in my opinion) the most ergonomic method and requires the least amount of behavior modification when learning how to reload with 2 mags attached together. The downside to this method though is for us in places like California or Canada, where magazine capacity is limited, is that 10 round AR mags just barely extrude below the mag well of the receiver.

This means that there is not enough space to clamp 2 mags together. That means the only option is to attach 2 mags at their floor plates. This is where the new 10/10 Cross Mag comes in. Previously the only solution was to remove the floor plates from a 10 round magazine and replace them with a special coupling one. While this does work, it also creates some issues around disassembly and changing the mag orientation for personal preference. Plus you also have to buy parts from multiple manufacturers which can also lead to customer support nightmares.

Fortunately Cross Industries has come up with a solution. They have built a new 10 round AR-15 magazine (called the 10/10 Cross Mag) with a special floor plate that allows you to use the mag in single OR coupled configuration. Additionally there are 4 different coupled configs you can set the mags up in depending on your personal preference. Even better they come in a smoked translucent look which means they look awesome too.

Fortunately Cross Industries has come up with a solution. They have built a new 10 round AR-15 magazine (called the 10/10 Cross Mag) with a special floor plate that allows you to use the mag in single OR coupled configuration. Additionally there are 4 different coupled configs you can set the mags up in depending on your personal preference. Even better they come in a smoked translucent look which means they look awesome too.

To top it all off it comes in at a very competitive price point of around $40 USD and is available at large retailers like Brownells.com. That’s a breakdown of around $20 per 10 round AR mag with a free mag coupler. A typical Magpul 10 round AR-15 mag goes for $14, so is the 10/10 Cross Mag really a good deal? If you are looking for just a single 10 round mag, clearly no. However if you are looking to for a solution that allows you to reload as fast as possible (looking at you competitive shooters) while also staying CA legal, then the answer is yes.

Consider having to buy 2x of the same Magpul 10 round P-Mags. You are now up to around $30. Then add in the cost of a 3rd party coupling device which is from $10 and up. Already you have hit the same price point as the Cross Mag, but are having to build your own setup and won’t have the same flexibility/customization.

Learning how to change mags with the 10/10 Cross Mag does require some new movements but it didn’t take long for me to adjust.

Now all of this is great, but does it work? The biggest issue with a number of AR mags on the market today is they flat out don’t work, typically with feeding. The 10/10 Cross Mag is designed for the standard 5.56 NATO round, which means it should also work well with 300 Blackout chambered ARs. In my testing I had no issues at all with ammo that was within spec. Below are the results from my testing:

Cartridge# of RoundsPass/FailNotes
223 Rem/5.56 NATO10PassWorked perfectly
300 AAC/BLK10PassWorks perfectly with any round having an overall length of 2.0″ or greater
I did try the 10/10 Cross Mag with some other cartridges NOT based off the 223 Rem case (i.e. 6.5 Grendel), but they did not function. In speaking with Cross Industries they are working on additional designs to support these cases specifically.

I want to reiterate that the 10/10 Cross Mag is not designed to support cartridges other than the 223 Rem/5.56 NATO round. I am also not able to get to a range at the moment due to the COVID-19 lock down and do any live fire tests. However all my function/torture tests show that this is a very well designed and made product that will double the ammo load out capacity while staying within the very restrictive laws of anti-gun governments. Regardless if you need something for competitive matches, or just want some extra rounds to “Return More Fire” the Cross Industries 10/10 Cross Mag is a great solution while staying legal.

calgunandprep.com, it’s affiliates, or Cross Industries are not lawyers. Nothing in this article should be taken as legal advice. It is the responsibility of the reader to know and/or understand the local laws regarding firearms, etc. that apply to them. If you have any questions about the legality of anything please contact a real lawyer. I read it on the internet is not a valid legal defense.