FLP-10 Terminus- Double Barrel Pump Action Foam Blaster

Update 8/26/26: Tighter magwells and shroud for better prime detent.

This is Terminus. It's got two barrels, two plunger tubes, two triggers, and uses two magazines. Terminus is the absolute best springer for under 250, if you don't mind a heavier blaster. Terminus allows you to fire two shots in immediate succession (or even at once), and features a prime selector enabling you to use each side independently- which means that you're not stuck with either an empty chamber or a double fed chamber. 

The immediate follow up shot has been described as “like a cheat code”- because if you miss your target, you just hit them with the second barrel. You can make tags on two different targets in immediate succession, faster than a flywheeler even; if you have a dart issue in your first barrel, you just pull your second trigger and you get the tag you might have missed. The utility of the second follow up shot is difficult to overstate.

Availability:

BearsWares has hardware and DIY kits here: https://bearswares.shop/products/terminus-by-shoelesshistorian

Print Settings:

• Primary Color: 4 walls 20 percent infill.

• Secondary Color: 4 walls, 20 percent infill. Supports for left and right pump shuttles, and pump grip front.

• Orange: 100 percent infill. Supports for plungers and spring caps.

If you have a 180 cubed printer, you'll need to use the split parts in their labeled folder. Same settings as the parts they replace, bow ties at 100 percent.

Build Guide:

https://imgur.com/a/hkCCcVl 

Materials Required:

• 3x M4x500mm threaded rods

• 12x M4 hex nuts

• 2x T4 bars

• 6x 10-32x5/16" screws

• 6x 10-32 hex nuts

• 2x Talon Claw length plunger tubes

• 2x 6.5" 788 springs

• 6x -123 O rings

• 4x 012 O rings

• 2x 016 O rings

• 4x 20mm long 4mm OD springs for sears and mag release

• 300mm length 8mm linear rod

• 2x LM8UU linear bearings

• 6x 6mmx7mm ball detents

• 2x barrels (40-45cm)

• 2x M3x70mm screws

• 3x M3x60mm screws

• 2x M3x30mm screws

• 6x M3x25mm screws

• 4x M3x20mm screws

• 38x M3x8mm screws

• 5x M3 hex nuts

Acknowledgements:

Once again big thanks to Bear for his support along this journey, and especially for making beta tester kits available! Also huge huge thanks to Frozenfade- for being the absolute coolest Nerfing buddy and spitballing ideas around with me, which eventually became this. Thanks to Silvernutter, Zoey from Foxfire, Zuko from Capital3d, CMXVII, Teamsticks…. too many people, honestly. I value all of y'all in the Nerf community, more than you know. Also shout out to the Utah Nerf Foam Flingers, with whom I tested Terminus for its first outings!