You can definitely mount the Stack-On GCB-900 (or the Stack-On Pistol/Ammo Steel Cabinet) to other Stack-On gun cabinets, but there are a few things you should consider.

Based on the manufacturer's product description, it comes with two removable shelves. That's pretty handy if you're thinking about stacking or mounting it with other cabinets since you can remove the shelves to fit larger items like ammo boxes or pistols.

Something to keep in mind, though, is that while the shelves are removable, you can't adjust them without making some modifications yourself. So, if you need different heights for the shelves, you'd likely have to drill some new holes. Of course, taking the shelves out altogether is no problem, giving you some customization for the interior setup.

When it comes to actually mounting it, you'll typically be using pre-drilled holes or some kind of fasteners to ensure everything stays put. The fixed shelf positions might mean you'll have to plan your storage a bit differently, but if you're comfortable with a bit of DIY drilling, you can make it work to suit your needs.

Apart from the shelf setup, the GCB-900 is known for its solid steel construction and black powder-coated finish, so it should keep your firearms and ammo secure. According to our research, people find it versatile and pretty reliable for expanding their firearm storage.

So, in short, yes, you can mount it with other Stack-On cabinets. Just be mindful about the shelf heights if you're planning on tweaking the interior organization. It's worth checking out your model's details and maybe even chatting with a pro if you're considering more extensive modifications or stacking setups.

The Stack-On GCB-900 Pistol/Ammo Steel Cabinet measures 21 inches wide, 10 inches deep, and 18 inches high, according to the manufacturer's product description. It's a compact, practical option for storing ammo and small pistols.

The cabinet is made from sturdy alloy steel, providing a solid home for your ammunition and keeping things organized. Inside, you've got two removable shelves, so you can adjust them to fit your needs, which is pretty handy. The interior is padded too, helping to prevent scratches on your stuff.

From what we found, people generally like the cabinet for its robust design and practicality. It's good at keeping ammo secure and tidy.

Just a heads up, though—some folks mentioned the shelves are fixed at set heights, but overall, it's seen as sturdy and fit for its purpose.

Security-wise, the locking mechanism gets a thumbs up both from what we gathered and professional insights. It's a must-have feature to keep any valuable items safe.

There's also the flexibility of pre-drilled holes and included mounting hardware. So, you can install it on top of a larger gun safe or directly onto a floor or in a closet.

This versatility makes it a nice choice if you're looking for something compact but solid for your ammo storage needs.

If you're looking at how secure the Stack-On GCB-900 Pistol/Ammo Steel Cabinet is, it's important to dig into the details beyond just how it looks. According to how the manufacturer describes it, this cabinet is made out of sturdy steel with a black powder-coated finish. This isn't just for style—it helps with durability and prevents rust, which is useful.

The main thing we want to know is whether your stuff is safe in there. It's great that it looks nice, but security mostly depends on how well it's built and the kind of lock it uses. The manufacturer says the steel is strong, which is a good base for keeping firearms and ammo secure. Our research shows that people like how it looks at home and also feel it does provide some security.

People who’ve used it also talk about its compact size, which makes it easy to fit in different spots without messing up the look of a room. The finish helps it blend in, but remember, its main job is to keep your items safe.

Professional feedback from places like OpticsPlanet mentions that the finish holds up well against daily wear, keeping things inside safe from dust and scratches.

But for real peace of mind, it's crucial to know what kind of lock it has. From what we can tell, there aren't any fancy lock features like you might find in other brands, so it likely uses a basic key lock. If you want something more secure, you might need to dig deeper into what it offers here.

So, overall, while the Stack-On GCB-900 looks good and is durable, think about whether its security features match what you need. Our research and the manufacturer's info suggest it's a solid choice for safe storage, but double-check the lock details and how it handles tampering if those are big priorities for you.