I have been working on prop builds for a colonial marine and predator outfit.

I about have my nerf gun modded to function as a poor mans smart gun as it were. Motion tracker resin kit build is progressing slowly.

Looking over the pulse rifle it appears I have enough space in the cavities to place an adafruit fx board with power supply, amplifier, and speaker and set trigger sounds for cocking and firing of the shotgun mechanism.

Has anyone tried this before?

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The impossible takes a while longer and goes over budget too...

The GL part provides enough space for your sound electronics.
BTW: If you don't want to do this from scratch you can also use e.g. a Majenko Pulse Rifle counter kit.
If you use the "Search" function you will find Evike/Airsoft build to help you.

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Sgt. Frank Peters 'reload' Smartgun Operator
A03/TQ3.0.12136E1 "It will be no picknick!"
AL Colonial Admin. - Sergeant at Arms (SgtA) -- 2020-2022
GERCM - Executive Officer (XO)
UKCM Foreign Legion: The Deviant Dragoons

this is just for the shotgun portion. I would have to completely redo the snow wolfe portion in the pulse rifle electronics to convert everything to 3.3V or 5V from 9V

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The impossible takes a while longer and goes over budget too...