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
– STL files will be included with kit purchase.
– If you select colored flatbars, you will receive a set of 6 bars since 2 are completely covered and not visible.
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
Magazines:
- Magazines NOT included. Magazines must be purchased separately.
- Compatible with Talon/Katana Magazines, and standard nerf magazines alike
- Compatible with angled magazines with an angled magazine adapter
Darts:
- Darts NOT included. Darts must be purchased separately.
- Compatible with standard nerf brand darts, as well as short darts
- Recommended darts: Worker Gen3 Darts
Attachments:
- Compatible with most standard picatinny-compatible attachment
- Compatible with all addons featured on the listing.



















Victor Barbarino (verified owner) –
This is a well thought out kit. Everything fit perfect. I had no issues with the prints from the download section. The processing time was fast and I received everything quickly. Thank you FF.
Frontline Foam (store manager) –
Absolutely, you are welcome!! We are very pleased to hear about your great experience!! Also so happy that everyting ran smoothly!! We can’t wait to work with you in the building of your blasters for the future!! Thank you so much for your support!!