Sawed-off shotgun (blaster)

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Updated January 15, 2026: The stand has been thickened for more stability

A shotgun model that can eject shells but cannot fire

The hand cannon from PUBG Battle Royale, with side-by-side double barrels, and the short barrel can be used as a pistol

1.    Assemble the grip and receiver 

Apply glue in the holes of the grip and receiver, as well as on the blue indicated surfaces of the grip, then use two 'grip connecting pins' to join these two parts

2.    Install the 'trigger' and 'trigger guard'

Apply glue in the corresponding holes of the grip, then insert the 'trigger' and 'trigger guard' onto the grip

3.    Install the barrel

As shown by the arrow in the figure, insert the 'barrel' into the slot of the 'receiver', then insert the 'pivot shaft' into the holes of the 'receiver' and 'barrel', and slightly tighten with a screwdriver Do not overtighten, as it is 3D printed, and its strength cannot be compared to metal screws

4.    Install the breach lever

Apply glue in the blue indicated hole in the figure, not too much, ensure it does not stick to the 'breach lever' shown in the figure Then insert the 'breach lever' into the hole of the 'receiver' in the direction of the arrow

Insert the 'breach lever-axis' into the recently glued round hole of the 'receiver' in the direction shown, press firmly until it fits snugly against the 'breach lever' Wiggle the 'breach lever' a few times to prevent it from sticking to the 'receiver'

5.    Assemble the ejector spring holder

Use a 0.5*5*20 specification spring (available in the CyberBrick hardware kit or can be purchased separately as BB007 from Maker's Supply) insert it into the reserved slot of the 'ejector spring holder'

Apply glue to the blue indicated surface, then insert the assembled 'ejector spring holder' into the barrel, use a 'shell casing' to help press it into place, then immediately remove the shell casing to prevent the shell casing from sticking to the glue remaining inside the barrel Install the 'ejector spring holder' in the other barrel using the same method For this step, a single 0.5*5*20 specification spring can also be cut in half and used as two The differences are as follows

• Using a half-length spring: After loading, reset the barrel, and the shell casing will automatically press into the barrel along the vertical surface of the receiver When the barrel is opened, the shell casing will pop out partially, making it easy to remove it by hand

• Using a full-length spring: After loading, you need to slightly press down the shell casing by hand to reset the barrel (otherwise, the shell casing will get stuck on the vertical surface of the receiver), and the shell casing will only automatically press into the barrel along the vertical surface of the receiver after it pushes against the vertical surface of the receiver When the barrel is opened, the shell casing will fully eject from the barrel, with no need to remove it by hand

6.    Install the forend

Use two 'forend fixing screws' to secure the forend to the barrel, note that the two screws are not the same length Do not overtighten to prevent the screws from breaking