Everything You Need to Build a Modular Gun in the UK
Building a modular gun in the UK has become increasingly popular among firearm hobbyists, collectors, and trainers. A modular gun allows you to easily swap components like the frame, barrel, or slide — giving you full control over customization, design, and display.
This guide from TopBoy Ghost Guns UK explains exactly what you need to build a modular gun legally, how to source compliant 3D printed gun kits, and where to buy ghost gun parts UK for sale—all in line with current UK regulations.
What Is a Modular Gun?
A modular firearm is a gun that can be customized using interchangeable components. These builds usually consist of:
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Frame or lower receiver
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Slide or upper receiver
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Trigger assembly
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Barrel and sights
In the UK, you can own non-functional or partially assembled ghost guns for educational, hobbyist, or display purposes. Our modular kits are sold for private, non-firing use, making them 100% UK-compliant.
Browse kits here:
Buy 3D Printed Gun Kit UK
What You Need to Build a Modular Gun in the UK
1. 3D Printed Frame or Receiver Kit
Start with a polymer or 3D printable lower receiver:
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Compatible with Glock, P80, or AR pistol builds
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Unfinished or display-only versions available
Ghost Gun Parts UK for Sale
2. Slide, Barrel & Trigger Assembly
Use dummy or display components to complete the look:
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Training barrels
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Non-firing triggers
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Custom slide prints (non-metal)
Buy Ghost Gun Display Parts
3. Modular Add-Ons & Rails
Upgrade with:
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Extended rails
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Sight options
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Textured grips
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Custom STL files
👉 Modular Gun Kits UK
Is It Legal to Build a Modular Gun in the UK?
Yes — as long as the gun is non-functional, not assembled to fire, and used for legal purposes such as:
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Educational training
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Display or simulation
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3D design experimentation
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Private collection
At TopBoyGhostGuns.uk, all products:
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Are sold unassembled and unfireable
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Ship securely across the UK
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Include legal usage guidance
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Comply with UK firearm law and postal regulations
Trusted Modular Gun Kits Available Now
G17 Modular Display Kit
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Build-ready polymer frame
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Interchangeable parts
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STL files available
🔗 View G17 Kit
P80 Glock Compatible Kit
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Full modular design
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Display barrel, non-firing trigger
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UK-legal and secure shipping
🔗 Buy P80 Ghost Gun Kit UK
AR Pistol Modular Kit
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Polymer 3D frame + dummy upper
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Perfect for hands-on modular builds
🔗 Shop AR Modular Gun Kits
Why Choose TopBoy Ghost Guns UK?
We are the #1 trusted ghost gun parts dealer in the UK, helping hobbyists and collectors build safe, legal, modular firearm kits with confidence.
We provide:
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Verified, UK-compliant kits
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Full customer support
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Easy-to-follow build guidance
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Secure packaging & delivery
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Legal modular upgrade options
