{"id":414639,"date":"2024-01-12T13:00:36","date_gmt":"2024-01-12T19:00:36","guid":{"rendered":"https:\/\/gunmagwarehouse.com\/blog\/?p=414639"},"modified":"2026-01-19T12:20:02","modified_gmt":"2026-01-19T18:20:02","slug":"zro-delta-modulus-modular-pistol-system","status":"publish","type":"post","link":"https:\/\/gunmagwarehouse.com\/blog\/zro-delta-modulus-modular-pistol-system\/","title":{"rendered":"ZRO Delta Modulus: Modular Pistol System"},"content":{"rendered":"

I’d never heard of the ZRO Delta company until a family member bought a handgun made by them. My curiosity was piqued, and I knew I needed to check the company out, discovering that they make pistols, rifles, and mounting solutions.<\/p>\n

Their mounting solution appears to be a set of scope rings that are made from aircraft aluminum.<\/p>\n

The rifles they make are AR-15-type in nature, and their pistols are modular Glock clones, which is what we’ll be taking a closer look at today.<\/p>\n

Glock Influence<\/h2>\n

There’s no question how influential Glock has been on the pistol market since the 1980s. Their quality and reliability have become legendary over the decades. Consequently, it’s no surprise that some companies have emulated or copied some aspects of the Glock. A few companies have downright copied the entire platform.<\/p>\n

Well, as they say, imitation is the best form of flattery.<\/p>\n

\"ZRO
The ZRO Delta’s Modulus is a Glock copy, and the controls are exactly as you’d find on a Glock. Even the takedown tabs are exactly the same. Note the forward and rear slide serrations and the flat trigger. (Photo: Jim Davis)<\/figcaption><\/figure>\n

Special Circumstances<\/h1>\n

A beloved family member of mine purchased this pistol during a very weird time, which happened to be amid the COVID-19 Panic Crisis. He was looking to buy his first handgun, and it happened to be during the worst period in history to buy a handgun. Most shelves were empty, both for weapons and ammunition. 9mm ammo was selling for $50 per box (FMJ range ammo) or more in some stores. You really couldn’t find a Glock on the shelves in the area where we live.<\/p>\n

The available handguns were marked up at insane prices as gunshops took advantage of customers. Such was the case here. They had the goods that people desperately wanted, and they knew it.<\/p>\n

Modulus<\/h2>\n

ZRO Delta’s 9mm pistol, the Modulus, is a modular unit that seems to slip into several roles.<\/p>\n

When I say it’s modular, I’m not kidding. There are three different Picatinny rail dust covers available, three different back straps, two different front straps, and three different magazine wells. Oh, and three different slides, all of which are cut to mount an optic. Everything can be mixed and matched right out of the box.<\/p>\n

Grip modules are available in Grey, Black, and Flat Dark Earth, for those who enjoy variety.<\/p>\n

There are a couple of different frames available. The Fire Control Unit can easily be removed from one frame and popped into another. It is the serialized part of the firearm that’s considered to be the actual firearm; for this model, the frame is not considered to be the firearm.<\/p>\n

\"The
The inner chassis, referred to as the FCU (Fire Control Unit), is the actual firearm. It’s seen here inside the frame. (Photo: Jim Davis)<\/figcaption><\/figure>\n

The various magazine wells give shooters options. The pistol we tested had a short magazine well attached, which placed the Modulus into a similar size category to the Glock 19<\/a>, which is a good size for concealed carry. The Medium magazine well brings the pistol’s grip length to approximately that of the Glock 17<\/a>. There is also a widely flared magazine well that is widely flared, and that one seems well suited to competition. The magazine wells are changed using one screw that screws into the bottom rear of the grip, and it only takes a few seconds to switch out.<\/p>\n

\"Modulus
The ZRO Delta Modulus (top) next to a Glock 19X to show how similar they are. Glock magazines fit the Modulus perfectly. (Photo: Jim Davis)<\/figcaption><\/figure>\n

Incidentally, Glock magazines fit this pistol. Specifically, Glock 19 and 17 magazines. All Glock magazines used in the Modulus worked well. We also tried the Magpul Glock magazines, which also worked well. Finally, Glock’s 33-round magazine<\/a> also functioned in the Modulus. The fact that Glock mags<\/a> work in this pistol is absolutely a stellar aspect, especially considering that Glock mags are among the very best of any on the market. Their durability is second to none, and their price is quite reasonable.<\/p>\n

Fit And Finish<\/h3>\n

The various parts of the Modulus pistol are precisely machined and fit together tightly. Where the magazine wells, dust covers, and front and back straps fit together, the fit is extremely well done, and there are no gaps.<\/p>\n

I’ll be honest, when I first was introduced to this pistol, my expectations were really pretty low. It’s a company that I’d never heard about before, and I figured they were fly-by-night.<\/p>\n

Looking at the fit and finish, though, this thing is put together with some impressive skill and attention to detail. Between all the front and back straps, dust covers, etc., there was absolutely no wiggling, wobbling, or other indicators that anything exhibited a fit that was less than perfect.<\/p>\n

Grip<\/h3>\n

The grip and frame are machined from aluminum. The front strap that came with the pistol has checkering that helps the shooter gain a good purchase on the pistol. The back strap has vertical grooves, which also let the hand gain some traction.<\/p>\n

\"Modulus
ZRO Delta’s Modulus pistol fits well in the hand. The aluminum frame feels a little different than a Glock, but it’s a very similar pistol. (Photo: Jim Davis)<\/figcaption><\/figure>\n

For those who prefer finger grooves, there are front straps with them available.<\/p>\n

There is a definite undercut under the trigger guard, which is great for getting a better and higher grip on the pistol. The front strap on our pistol had the flat version installed, and that’s what we went with. It was comfortable and worked very well.<\/p>\n

Slide<\/h3>\n

There are three slide-length options. The one we used matches the Glock 19 slide, which is an all-around good slide length for general carry of the concealed variety. It would even suffice for duty use these days. Barrel lengths vary with the slides, coming in at 4.01, 4.58, and 5.31 inch formats. There’s actually a kit that can be purchased with the pistol that includes all three slide and barrel lengths, various front and back straps, and all the other trappings that are optional for the Modulus. Or you can purchase each pistol as a stand-alone without all the options (as in our case). Individual option pieces can be purchased from ZRO Delta.<\/p>\n

The slide’s color is a matte black. In addition to rear cocking serrations, there are also forward serrations.<\/p>\n

All slides are machined to accept an optical sight and come with a plate installed to fill the cutout.<\/p>\n

Sights<\/h3>\n

The factory sights sucked. They were all black silhouettes and were nearly impossible to see in anything but bright sunlight on a light-colored target. For combat shooting, they were entirely unserviceable. At his earliest convenience, they were replaced with night sights<\/a> by the pistol’s owner. Whatever would possess a company to put all-black sights on a combat pistol is beyond me.<\/p>\n

Controls<\/h3>\n

All controls are exactly like a Glock (shocking, right?). The slide release and magazine release are standard Glock. The magazine release can be moved from the left side of the receiver to the right side.\u00a0 Even the takedown tabs are the same, and the pistol field strips just like a regular Glock. Once you’re inside the pistol, you’d swear it was…a Glock.<\/p>\n

Every component, as far as we can tell, is just like a Glock.<\/p>\n

\"Modulus
Internally, the Modulus is identical to a Glock. The author is told that many Glock parts are interchangeable. (Photo: Jim Davis)<\/figcaption><\/figure>\n

How It Feels<\/h3>\n

Because the frame is metal, the pistol has an overall solid feel. I wouldn’t say it’s better than an actual Glock, but it’s a little different, and slightly more solid feeling.<\/p>\n

All in all, the recoil impulse and the general feeling of how the pistol shoots is very similar to a Glock. Which makes sense since it’s basically a copy of a Glock<\/p>\n

Trigger<\/h3>\n

One criticism I have is the trigger pull. It is heavy<\/em>! As in, heavy enough that the first couple of times I fired the pistol, I pulled the shots significantly low until I adjusted for the trigger. I didn’t have a trigger gauge to measure the exact weight, but I estimate it to be around eight pounds or so. The takeup is exactly like a Glock, then it hits the wall. Other than the very heavy break, the break is crisp and feels just like a Glock.<\/p>\n

Once we got over the heavy pull, it was no problem to fire the pistol accurately. Is the trigger a detriment? I’d say no, once you get over the heavy break. But it sure could be significantly lighter for our taste.<\/p>\n

The trigger is also flat.<\/p>\n

At The Range<\/h3>\n

Reliability is 100% so far. Accuracy with the Modulus is similar to Glock, and I couldn’t tell the difference between this pistol and the many Glock 19s that I’ve fired over the years.<\/p>\n

\"Modulus
The Modulus in full recoil. It feels very similar to firing a Glock, but a little more solid in the hand, considering the aluminum frame. (Photo: Jeremy Charles)<\/figcaption><\/figure>\n

As mentioned, the recoil impulse is similar to the Glock, but the Modulus feels more solid in the hand due to its aluminum frame. For me, it’s not better or worse than a Glock, just slightly different.<\/p>\n

All in all, the ZRO Delta seems to match the Glock at the range. Granted, we didn’t put tens of thousands of rounds through it to see how it compares to the Glock in the long run, but so far, it’s doing well.<\/p>\n

Overall<\/h1>\n

With all the various barrel length and frame length options available, the Modulus could be used for concealed carry, duty, and competition, making it a very versatile pistol.<\/p>\n

Our Glock 19-sized configuration fits into a DeSantis holster intended for the Glock 19, so all other holsters that you can stuff a Glock 19 into will likely work just fine for the Modulus.<\/p>\n

I’ll be totally honest – when my family member bought this pistol, I’d never heard of ZRO Delta, and I thought it was going to be a low-quality pistol built by a fly-by-night company. But I have to say, it is a quality pistol that is reliable and about as accurate as any Glock pistol that I’ve fired. It seems to do Glock about as well as Glock does Glock. Let’s say that I was pleasantly surprised by the quality of this pistol, and the more I shot it, the more highly I thought of it.<\/p>\n

Personally, I’d still choose a Glock over this one because I’ve been using Glocks for decades and am intimately familiar with them. With that said, ZRO Delta has a decent thing going here.
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