U Caliburn Hardware Kit

(2 customer reviews)


Contains all the hardware needed to assemble a U Caliburn (a design by captainslug). Darts, magazines and printed parts sold separately.

*Blaster is not useable without a foregrip attachment*

Aluminum Trigger (+$15.00)
Aluminum Sear (+$20.00)
Aluminum Pcap Plate (+$15.00)
Railgasm Hardware (+$2.00)
Carbon Fiber Wrap (+$15.00)
Scar Hardware (+$8.00)
Rubber Grip Sleeve (+$10.00)
Product total
Options total
Grand total


– Contains all hardware needed to assemble a Nerf U-Series Caliburn, designed by captainslug on Thingiverse.
– Assembly instructions provided by captainslug: U Caliburn assembly instructions.
– Default barrel is 14” length 0.527″ ID barrel
– Compatible with Caliburn springs and Pro-series Turf springs
– Add-ons sold separately
– If ordered with 509 or 495 barrel, will include barrel adapter
– Kit includes aluminum ramcore with o-ring notch and Vanguard
– Pcap plate requires modified Pcap print available here
– You can purchase an assembled U Caliburn here

Optional Add-ons:
– Additional springs can be purchased here
– Railgasm
– SCAR Barrel
– Ported MuzzleBrake
– Aluminum internals
– Varying barrel types
– and more!

Darts & Magazines: 
-Compatible with full length nerf darts & elite style magazines
-Compatible with half darts & Worker Talon Magazines with Wildcard adapter

Access to files for printing your own parts available here: Print Files Download

**Design used with permission.

Additional information

Weight 2 lbs
Dimensions 28 × 3 × 3 in

K26, K25, 788, K31, 8kg (+$6), 10kg (+$6), 18.5kg (+$6)

Spacer Tubing

Black, White, Metal (+$12), Carbon Fiber (+$20)


Short Dart, Full-length Dart

2 reviews for U Caliburn Hardware Kit

  1. Derek Martin (verified owner)

    This is a powerful and sturdy blaster and besides some small issues I ran into, this kit works very well. I selected aluminum plunger and rambase with a Pro25 spring and got 294 FPS average with a 24″ .509 barrel. I was building a Talon/Katana variant of the Caliburn, which requires an extra small spring for the two magazine releases. This kit only comes with 2 small springs when I needed 3. I believe I also needed an extra bolt not included in this kit for attaching the grip insert. I think the grip insert is technically optional, but it would be nice to get some spare parts with this kit, even just incase you lose one.

    The worst problem I had with the kit was the included pins, the ones the trigger and magazine releases pivot on. I found them to be far too small in diameter to work well; the trigger was wobbly and often locked up and was unusable. I luckily had some other larger pins (0.100″) on hand that worked much better and so I didn’t even use the pins in the kit.

    With my own pin in the trigger and a workaround for the magazine release spring, this is a Five Star blaster. If the pins provided in the kit were improved and a few extra spares were included for some of the other parts, this is a 5 star blaster kit.

  2. Allan Turner

    Ordered this kit for my son and I to build. He loves it. Operates better than expected. We had a couple of minor issues which were quickly resolved through customer service

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