U Bullpup Hardware Kit

(1 customer review)


Contains all the hardware needed to assemble a U Bullpup (a design by captainslug).

Non-visible screws are still silver.
Aluminum TriggerMain (+$15.00)
Aluminum Sear (+$20.00)
Aluminum Pcap Plate (+$15.00)
Aluminum TriggerD (+$15.00)
Aluminum TriggerLink (+$15.00)
Product total
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Grand total


– Contains all hardware needed to assemble a Nerf U-Series Bullpup, designed by captainslug on Thingiverse.
– Assembly instructions provided by captainslug: Bull Pup assembly instructions.
– Includes ramrod with o-ring cutout by default, so no upgraded ram is necessary
– Compatible with cutdown Caliburn springs and Longshot springs
– Springs offered as kg ratings are Longshot springs
– Add-ons sold separately including top rail railgasm hardware
– Printed parts available here
– If ordered with 509 or 495 barrel, will include barrel adpapter
– Length of spring included is: 9″ K31, K26, or 8-3/8″ K25, 788 springs.
– Hardware included is based off of v4 Talon Claw hardware. Similar to v3, but the top rails and priming bars are about 1/2″ longer. Cross compatible to captainslug’s original files with the exception of the top rail needing to be a hair longer. You can download a modified rail segment file here.

– Additional springs can be purchased here
– Railgasm
– Scar Barrel
– Ported MuzzleBrake
– Aluminum internals
– Varying barrel types
– and more!

Printer Files: 
Access to files for printing your own parts available here: Print Files Download
– Pcap plate requires modified Pcap print available here.
-Modified rail segment file download here.

Special thanks to Captain Slug for the great design. Used with permission.

Additional information

Weight 2.0625 lbs
Dimensions 10 × 2.25 × 2.25 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

1 review for U Bullpup Hardware Kit

  1. kenneth.buckingham (verified owner)

    The hardware is modified from slugs design, you have to use some modified files to accommodate, if you want to install a upper rail.

    The black hardware is only sort of enough for the outside, and the long 10-32 are sockets not buttons, so they won’t work in some areas of the blaster.
    I also never received the normal silver hardware for use internally so watch out for that.

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