Repeating Crossbow

A lego repeating crossbow with magazine and rotating reloading arm. With Pro-building instructions !


Direct purchase of the instructions

Preview of the instructions at the end of the article.


After uploading the video of my first crossbow, you were many to ask for instruction. I did not make it because this crossbow was not perfect, regarding the reloading, reliability and power. That is why I decided to create a new crossbow with better loading and reloading and power.


The model was inspired by a Chinese Repeating Crossbow, you can read here an article about it to understand the functioning. The basic functioning is to have a rotating arm which reloads the arrow with a little gap at the end to lock the string. Then the trigger pushes the string and liberates the arrow.


The main points are the little gap to lock the string, and the design of the magazine. The first in order to lock correctly the string without damage it, and release it without too much force on the trigger. The second point is in the front of the magazine, in order to release one arrow by one arrow and lock it when the magazine is reload. The arrow is stuck partially in the magazine when the string pass through (the sliding path is lower than the string).


Also, the crossbow is equipped with some interesting design for better handling. Including a solid body to hold it, two small pin in order to lock the loading arm in loaded position (right or left handed person). To finish, the magazine can stock 7 arrows and is very reliable. That is why I have made building instructions !

Building Instructions

As I said I have made pro building instructions using MLcad and Lpub. As usual, you can buy it for 5€ and then download the instruction immediately. Here is the complete bill of material in picture file : Crossbow_page_42

But you can also checked it on rebrickable (or make any export you want)

Want to know if you can build the Crossbow ? The Crossbow  has been indexed to rebrickable, check it !

You can buy the instructions with the following button for 5€. You can also buy other building instructions and get an automated discount. You will get 15% off for 2 PDF, and 20% off for 3 PDF on the total), available for all the instructions for sale on

See it on the shop :


After your payment, you will be redirected to a page for downloading your instructions, and will receive also the link to download by email. Please check the spam box and be patient to receive it. If you have trouble to download your copy of the PDF after payment or open the document, do not make a paypal dispute, please contact me using the contact form. The link to download the instructions expires within 24h. Contact me if you have lost your instructions. Note that you can print it, but not copy or distribute. Thank you for supporting my work 🙂

Here is some preview of the building instructions :

Important note : Please consider that this crossbow is a weapon and must be handle with care. Do not shoot against animal or humans.

Here is a video in order to set up the crossbow : string pre-tension and magazine. Note that you I advise to use standard lego string and yellow / black shock absorbers for the power. You can use other but the performance will be not the same.


(4) Comments

    It is used to connect the two arm, so it has to be a rope and not an elastic, as the tension on the arm is made with the shock absorbers instead of a rubber band.

    What is used for the rope? I see it is 30cm. Is it a rope or elastic? Is it a lego part?

    I have tried it and it works for me to pay with either balance or debit/credit card, maybe a restriction in your country ?

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