C4 Caliburn 4 Hardware Kit

(7 customer reviews)


Contains all the hardware needed to assemble a C4 (Caliburn 4). *Necessary Printed Parts NOT included*

Aluminum Trigger (+$15.00)
Aluminum Sear (+$20.00)
SCAR Hardware (+$8.00)
Rubber Grip Sleeve (+$10.00)
Aluminum Rambase (+$20.00)
Plunger Black Acetal (+$21.00)
Plunger White Acetal (+$21.00)
Plunger Aluminum (+$31.00)
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The Caliburn C4 is a homemade Nerf blaster originally designed by CaptainSlug. Pump action, mag-fed, variable fps. Darts, mags, and accessories sold separately.

Kit includes all hardware necessary to build a C4. *Necessary Printed Parts NOT included*

*C4 not compatible with K14 spring

Blaster Features:

  • More dry-fire safe than predecessor. Great for beginning nerfers.
  • Quick-access buttplate for easy spring swap to adjust power
  • Compatible with both half and standard (elite) dart types with passive magwell adapter
  • Increased durability & rigidity from the previous versions
  • Compatible with most standard picatinny attachments and Caliburn Lower Stock Spacers
  • All Flat bar construction
  • Tool-free passive talon/nstrike mag adapter
  • Faster spring-swaps
  • Optional air-brake plunger feature
  • Maintains the takedown feature
  • Optional o-ring collet muzzle for fast barrel swaps
  • Supports elastic and extension springs for accessories
  • Higher rigidity mixed-print-orientation grip assembly
  • Still compatible with Tooth-And-Nail and other aftermarket parts



  • Darts NOT included. Darts must be purchased separately.
  • Compatible with standard nerf brand darts, as well as short darts
  • Recommended darts: Worker Gen3 Darts


  • Compatible with most standard picatinny-compatible attachment
  • Compatible with all addons featured on the listing.


Additional information

Weight 2.0625 lbs
Dimensions 18 × 2 × 2 in

7 reviews for C4 Caliburn 4 Hardware Kit

  1. sean carey

    Great kit, went together easily with the assembly instructions. Took a little while to ship it to me but I am in Canada so I expected that.

  2. Dylan Crider (verified owner)

    One thing I can note on the C4 kit is both kits I purchased seemed to have the holes slightly offset from where my prints were, I checked my prints dimensions and they seemed correct but the holes just barely lined up between the print and metal peices. Didn’t make it unusable though, and FLF has since fixed the issue.

  3. Robert Vroegindeweij (verified owner)

    You guys really went above and beyond to get it to me too.
    Kit performs great! It’s nice and over-complete,
    Extremely happy with the cnc’ed plunger and trigger, they’re properly finished too, no sharp edges or nothing.
    Would definitely buy from you guys again.

  4. Andrew Wert (verified owner)

    The kit was of good quality. I would have appreciated a build guide video as my kit didn’t go together as well as my previous purchase

  5. Daniel (verified owner)

    Frankly, I’ve ordered kits from a few different companies, and yours was the most smooth, no nonsense experience. When I reached out for questions on the engineering, you were able to answer intelligently. I’ve since reached out directly to Slug with some feedback and questions, and will be designing some blasters based on his designs. My experience with your company is reflective of how I want to treat my customers, so when the time comes for someone to make my kits, I’ll most likely be reaching out to you.

  6. Anonymous (verified owner)

    The kit works exactly like it should and I have had no issues with functionality.

  7. Casey Tackman (verified owner)

    The Caliburn 4 hardware kit worked great with my build. Would highly recommend for those who are looking to build their own caliburn. All the parts fit together great, with several spare pieces.
    Build video on YouTube was very helpful for reference during assembly.

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