NERF Fortnite Flint Knock in-line clip mod

This is a very straightforward barrel swap mod for the NERF Fortnite Flint Knock blaster that turns it into a dueling pistol with two extra follow-up shots. As always, I've given you some options. There are three muzzle styles: Flared, flat and banded. You should print the flared version for maximum fun, but I understand if you want to put it in a holster or something. STEP files included, as always.

The in-line clip geometry was developed by Corvus, who has a lot of cool stuff on their profile that you should go check out.

This is a super easy blaster to take apart and work on. All the shell screws are the same size and the internals are held in place by other screws, not just hopes and dreams. You can leave the internals in place for this whole mod and easily slip the plunger tube off or put spacers on the spring stem. You can also test fire it with the two halves just firmly held together. That's how I determined that you probably don't want to use more than 8mm of spring spacer on this thing if you want it to remain practical. It barely boosts the fps to 65 at the expense of a much heavier draw. With the stock spring and no spacers, this in-line shoots about 55fps. The plunger tube in this is kinda small and that's just the best we can get out of it with all the air restrictions and dead space that come with in-line clips.

The inner diameter of the end of this barrel NEEDS to be 12.8mm to work properly. That's just a red one past a half inch. Be prepared to print a small slice of it to adjust your xy hole epxansion settings until you get it right. I am providing two models: One with the correct 12.8mm diameter modeled in, for those of you with accurate and high performance printers. One model with 12.95mm diameter for us plebes with lower tolerance printers that always reduce inner hole diameters. Please test a small portion of the barrel to determine which one to use and size in your slicer. Again, do not expect it to just work without making sure the ID is 12.8mm first.

This blaster is far from sealed. You will probably want to either wrap the barrel and plunger tube connection with electrical tape or use glue. (Tape works great, for what it's worth) You may also want to lubricate the o-ring and put some teflon tape under it for a tighter fit.

The muzzle is pressed on and should probably be glued in place even if it seems like a tight fit. The reason is that even though this in-line clip works most of the time, if you're using particularly stiff foam darts (like worker heavies) you'll get misfires on the third shot. So I still flick the thing on the third shot, and if the muzzle wasn't glued on, it'd be flying across the field. You can still take the blaster apart with the muzzle glued in place so there's not much risk there.

Files provided in proper printing orientation. You should only need supports on the bottom of the model, and maybe a brim.

Used dimensions from inner barrel diameters to create in-line clip. No hardware required, but glue and tape recommended.