Not sure which building block gun to buy? Answer three questions — how long a build you want, whether you need it to fire, and how much you want to customize — and the right brick gun picks itself. At POPLAYO that means the G17 pistol at $48.99, the firing Uzi at $58.99, or the 1,698-piece MP5 and 1,502-piece KSV for serious builders.
A building block gun (also called a brick gun, building block toy gun, or MOC model) is assembled from interlocking plastic bricks. You snap it together following the manual, then end up with a realistic replica for display, customization, or — on select models — actual firing. Brick guns combine the patience-testing fun of construction toys with the collector appeal of realistic toy guns, and they are one of the fastest-growing toy categories of 2026.
Decision Tree: Which Building Block Gun Fits You?
| Your situation | Recommended model | Why |
|---|---|---|
| First brick gun build | G17 Building Block Pistol | Quick handgun build, movable slide, detachable magazine |
| Want a brick gun that fires | Uzi Building Block Gun | Only firing model — 359 pieces, working mechanism |
| Want the biggest project | MP5 Building Block Gun | 1,698 pieces, adjustable scope, pullable bolt |
| Want maximum customization | KSV Building Block Gun | Swappable barrels, folding stock, removable magazine |
| Buying a gift for a hobbyist | MP5 or KSV | High piece counts feel premium and personal |
G17 Building Block Pistol — The Entry Point
The G17 Building Block Pistol at $48.99 is the best first building block handgun. It is a cosplay display construction toy with realistic details — movable slide, detachable magazine — and most builders finish it in an hour or two. It works as a desk piece, a cosplay prop, or a gateway into bigger builds.
Uzi Building Block Gun — The Only One That Fires
The Uzi Building Block Gun Toy at $58.99 is the standout: 359 pieces that assemble into a submachine gun with a functional firing mechanism. It is the middle option — more project than the G17, less marathon than the MP5 — and the only building blocks gun in the range that actually shoots.
MP5 Building Block Gun — The 1,698-Piece Flagship
The MP5 Building Block Gun is the biggest brick gun at POPLAYO: 1,698 pieces, roughly 48cm long, with an adjustable scope, detachable magazine, and pullable bolt. It is a static display model — no firing — built for adult collectors who want a multi-session project and a museum-quality result. If someone searches for an mp5 toy gun that is a true construction experience, this is it.
KSV Building Block Gun — The Customizer’s Pick
The KSV Building Block Gun Toy matches the MP5 in scale at 1,502 pieces and adds the most reconfiguration options: swappable barrels, a folding stock, and a removable magazine, wrapped in a cyberpunk Night Phantom design. Choose it when you want comparable size but more ways to modify the finished model.
Brick Gun Comparison Cheat Sheet
- G17: $48.99 · handgun · 1-2 hour build · display/cosplay
- Uzi: $58.99 · 359 pieces · fires · the interactive pick
- MP5: 1,698 pieces · ~48cm · static display · the flagship
- KSV: 1,502 pieces · swappable parts · static display · the customizer pick
Building Block Gun FAQ
- What is a building block gun? A toy gun you assemble from interlocking plastic bricks, LEGO-style, producing a realistic replica for display or play.
- Do building block guns shoot? Some do. The POPLAYO Uzi fires; the MP5 and KSV are static display models.
- How long does the MP5 take? With 1,698 pieces it is an expert-level, multi-session project for most builders.
- Are they compatible with LEGO bricks? Some models are; check each product page for compatibility notes.
- Where can I buy a brick gun? Browse the building brick gun collection or the full POPLAYO shop.
Build Your Decision
New to brick guns? Start with the G17 Building Block Pistol. Want a working blaster? Take the Uzi. Ready for the marathon? The 1,698-piece MP5 is waiting.
Read our detailed MP5 building block gun review for the full spec breakdown.