this post was submitted on 09 Oct 2025
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This is a teaser for the Quokka-15 bufferless AR — a successor to the Marsupial MK18, brought to you by the same development team.

https://en.wikipedia.org/wiki/Quokka

Key improvements include:

  • Single guide rod
  • Mil-Spec lower compatibility
  • Slimmer overall profile
  • Folding forward charger
  • Stiffer handguard mount
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[–] some_kid6 4 points 1 month ago* (last edited 1 month ago) (4 children)

It'll need to use the Dissent back plate/stock option to hold the spring in but it looks like it fits with all the FM15 options otherwise. Here's some pics. ~~It'll be an SBR with a 16.5" bbl since the OAL is 24.5" but that's easy enough to fix.~~

edit: i forgot OAL is with stock extended

[–] TheShittinator 5 points 1 month ago* (last edited 1 month ago) (3 children)

OAL is measured with the stock extended, no?

EDIT: This is super exciting though, means the bullpup I've been planning for like a year is about to get a shit ton more printable.

[–] Thunder2k 5 points 1 month ago (2 children)

The Phantom Pup assembly manual has OAL with a 16“ barrel at 26“ with the stock extended. Obviously I don’t know how long the receiver on the Quokka is but I‘d be surprised if it was that much shorter than the FM-15.

Dude I am stoked by this development, ever since the FM-15 upper prices got hiked I have been holding out for someone to make exactly this possible.

[–] some_kid6 2 points 1 month ago

Oh right I forgot it's measured with the stock extended! It should be the same lengths as the FM 15 upper

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