Check-Mate Reveals Its Ultra-Hi Capacity Double Stack 1911 Magazine

Check-Mate has unveiled its new 1911 Double Stack Ultra-Hi Capacity 126mm Magazine with a flush fit base, and while two more rounds doesn’t sound like a lot, 19+1 capacity without extended base pads is groundbreaking, especially for concealed carry. As a recognized industry leader and manufacturer of many OEM and aftermarket magazines, Check-Mate promises its new Ultra-Hi Capacity Double Stack 1911 Magazine is cutting-edge and standard redefining for the firearms industry, demonstrating unparalleled capacity and reliability in a compact form factor for Double Stack 1911 enthusiasts.
In developing and launching the Ultra-Hi Capacity Double Stack 1911 Magazine, Check-Mate is responding to the demands of competitors and shooters, having leveraged feedback from the largest brands in the firearms industry, by packing an impressive 19 rounds of 9mm into the footprint of a standard 17-round magazine with a flush fit design. This innovation comes from more than a decade of 1911 double-stack precision manufacturing experience.
Features…
Check-Mate’s Ultra-Hi Capacity Double Stack 1911 Magazine isn’t only about capacity. The magazine was also designed with an improved feed angle, engineered to provide reliable and consistent performance under any condition, using both hollow-point and FMJ ammunition. Newly designed patent-pending spring and follower technology increases lockback power by 50%, ensuring smooth and predictable operation to the last round. The Ultra-Hi Capacity Double Stack 1911 Magazine features advanced design, materials, and manufacturing processes, including an all-aluminum basepad and steel retainer for maximum made-in-the-USA durability and longevity.
"Check-Mate’s commitment to innovation is at the heart of this launch… We’ve listened to our customers and partnered with industry leaders to create a magazine that not only meets but exceeds expectations. This isn’t just a product - it’s a revolution in firearm reliability and capacity, designed for the next generation of shooters,” says Check-Mate Vice President, Jackie Santoro.
Availability…
Check-Mate’s new 1911 Double Stack Ultra-Hi Capacity 126mm Magazine is available now on the company’s website at an MSRP of $84.99. I have it on good authority that we will start seeing these as OEM equipment on some familiar and high-end double-stack 1911s shortly as well.
Well, thankfully I don’t own too many 17-round magazines because I can see those being cannibalized real soon. I’ll likely add extended base pads to the ones I currently have since this new 19-round game-changer is likely to become my standard when carrying a 2011. I know they cost a pretty penny, but if you already own a gun that uses these, chances are you’re invested already and your bargain bin days have long since sailed. What do you guys think of the new Check-Mate Ultra-Hi Capacity Double Stack 1911 Magazine? Let us know in the comments below.
For more information on all Check-Mate magazines, parts, and accessories, please visit checkmatemagazines.com.

2A enthusiast. If it shoots, I get behind it, from cameras to firearms. | DTOE = Darwin's Theory on Everything | Instagram, YouTube, X: @dtoe_official
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will this 19rd mag work in the 9mm DS Prodigy full size frame?
This looks and sounds like a nice mag (I know Check-Mate makes good quality gear) but I'm not sure the 19+1 capacity is exactly "groundbreaking". In the late 80's or early 90's Ram-Line made extra capacity 9mm mags for a variety of pistols (I had a Taurus PT-99) and I'm pretty sure it was a flush fit 19+1 capacity. I'll have to dig it out and check. It was actually an interesting concept as it used a coil spring riveted to the top of the mag as opposed to the standard zig-zag style springs. This allowed rounds to be inserted right to the bottom of the mag as there was no spring at the bottom taking up space. It was dependable for range use but apparently the feed lips had a tendency to fail due to fatigue. This was in the early days of synthetic gun parts so the quality of the plastic was suspect. Aside from the high capacity the other good part was they were cheap (around $10-15). it would be interesting to revive the concept using modern materials and manufacturing techniques to see if the early problems could be overcome.