B.R.A.T - Cap Powered Mini Magnum

B.R.A.T (B.O.W Rapid Annihilation Tool) - Cap Powered Blaster

IMPORTANT!: This is a toy that fires a projectile using the caps from a toy cap gun as a propellent! This not suitable for small children and adult supervision is recommended. Never fire at animals or unwilling participants. This can damage drywall and eyeballs, use caution and wear protective eyewear, you never now how things will ricochet. Never brandish this as a real weapon or bring it out in public. Just because you know it's a toy, doesn't mean other people will. Make sure to check your local laws regarding replica firearms/ toy guns, as many places require a bright orange muzzle. Enjoy, be safe, and be smart!

After playing around with the super cool 9x19mm cap-powered toy rounds designed by @Letitfire, I wanted to design a small but powerful single-shot blaster built around their ammo design. The B.R.A.T is inspired by the high power magnums used for eliminating bio organic weapons in the Resident Evil video game series, but reimagined for protagonists who are not 'roided out boulder punching a-holes. Results may vary depending on the brand and strength of caps used.

UPDATE: MAY 19, 2026

• Added rifled tube and slugs

UPDATE: MAY 11, 2026

• Added the 12mm XL barrel.
• Added 2 new shotshell style ammo types.

UPDATE: APRIL 30, 2026

• Added 3 lengths of 6mm BB rounds that can hold and fire 1 to 3 6mm plastic BB's at a time.
• Added a new frame with a handguard.
• Added a new barrel.

UPDATE: APRIL 22, 2026

• Added the hold-out barrel and Maple leaf Grips

THE B.R.A.T:

THE BABY B.R.A.T: 

B.R.A.T - XL (12mm)

Features:

• Breech Loading
• Casing Extractor
• Powerful Firing
• Straight-Pull Charging
• Compact
• Multiple barrel options
• Multiple ammo options

Ammo Types:

Hardware:

M3x8mm Machine Screw x 3

M3x20mm Machine Screw x 4

M3 Hexnut x 5

0.8x10x50mm Compression Spring x 1

0.5x5x20mm Compression Spring x 2

Cap Gun Caps (Ring-Style)

Printed Parts:

ASSEMBLY INSTRUCTIONS:

Step 1: Barrel Latch

Insert one of the springs, followed by the barrel latch into the upper pocket in the rear of the barrel. Secure it with an M3x8mm screw through the top of the barrel.

Step 2: Extractor

2a) Insert the extractor into the smaller pocket on the rear left of the barrel. It may need to be sanded or filed down a bit to esnure that it moves smoothly.

2b) Apply a dab of superglue to the end of the extractor bar, then insert it into the extractor nub. Once dry, insert the assebly into the slot in the side of the barrel and into the extractor.

Step 3: Lower Frame

3a) Insert the trigger into the lower frame and secure it with a M3x20mm screw and hexnut.

3b) Insert the spring into the circular pocket in the upper frame.

3c) Insert the striker latch and hold it down with your thumb so that it is aligned with the screw hole. Secure it with a M3x20mm screw and hexnut.

3d) Apply super glue to the circular pockets on each side of the grips and insert the grip connector dowels.

3e) Put a drop of superglue into the pockets on the back of the grips and align them with the grip connectors in the lower frame. Press together and allow to dry. Reapeat for the other side.

Step 4: Upper Frame and Striker

4a) Press and M3 hexnut into the front of the striker and then screw in an M3x20mm screw all the way through so that the end of it is sticking out of the front of the striker.

4b) Place either side of the upper frame onto the lower frame and hold it in place.

4c) Place the striker into the open side of the upper frame and then place the 0.8x10x50mm spring behind it.

4d) Place the other side of the upper frame into place and secure it with 2x M3x8mm screws and hexnuts.

4e) Apply a dab of superglue to ends of the striker arms and then press on the charging handles to both sides. Allow to dry fully.

4f) Attach the assembled barrel to the assembled frame with an M3x20mm screw & hexnut.

AMMO:

Printing Tips: To get the best results when printing the ammo, ensure you have “archane” style walls and 0.12mm layer height.

ENJOY!