Build a Medieval Siege Weapon from Wood — The JoBolt Siege Ballista Kit

A ballista is essentially a giant crossbow. In the Middle Ages, armies used them to hurl bolts and stones at castle walls, fortifications, and enemy formations. They were engineering marvels of their time — powerful, precise, and built entirely from wood and rope.

The JoBolt Siege Ballista is a 142-piece laser-cut wooden puzzle that builds into a working replica of one. Wind back the arms, load it up, and fire. It actually launches. Two to three hours of building, and then you have a functional medieval war machine on your desk.

What You're Building

The ballista is one of the most satisfying kits in the JoBolt range precisely because it does something. It's not just a display model — the torsion arm mechanism actually works. Wind back the arms using the included mechanism, place a bolt, release, and it fires. The engineering that made these weapons so effective in the 12th century is the same engineering you're building here, scaled down and made from precision laser-cut wood.

The finished model measures 21 × 18.5 × 19 cm — compact enough for a desk, detailed enough to be a proper display piece.

The Build

142 pieces, around two to three hours. One of the quicker builds in the range, which makes it a great entry point if you haven't tried a wooden puzzle kit before — or a satisfying afternoon project if you have. The illustrated English guide walks you through the frame, the torsion arms, the firing mechanism, and the base in a logical sequence.

No glue required. Everything snaps together with the precision you'd expect from laser-cut wood. One tip: once it's assembled, rub a little candle wax on the moving parts. It makes the mechanism run noticeably smoother.

Who Is It For?

• History enthusiasts — medieval warfare, siege engineering, and the mechanics of pre-gunpowder weapons
• People who like making things — a shorter build than most kits in the range, but no less satisfying
• Teenagers and older kids — recommended for ages 12 and above, and genuinely engaging for that age group
• Gift buyers — a working medieval siege weapon is a genuinely unexpected gift. Birthdays, Christmas, Father's Day — it works for all of them
• Anyone who wants something different on their desk — because not many people have a working ballista

Once It's Built

Wind back the arms, load the bolt, release. It fires. That's the moment that makes this kit different from a static display model — there's a payoff, and it's a good one. It sits on a desk looking like a serious piece of medieval engineering, and every now and then you wind it back and fire it across the room.

People always want a go.

What's in the Box

• 142 laser-cut wooden pieces
• Full step-by-step illustrated assembly guide (English)
• All accessories included

Quick Specs

• Pieces: 142 laser-cut wood
• Assembled size: 21 × 18.5 × 19 cm
• Assembly time: approx. 2–3 hours
• Weight: 520 g
• Recommended age: 12+
• Certification: CE
• No glue required

The JoBolt Siege Ballista is £69.99 with free UK delivery. If you want a build that actually does something when it's done — or a gift that nobody else will have thought of — this is it.