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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Cake day: October 3rd, 2025
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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

A bufferless AR15 upper