Originally Posted by aklover_91
That's why I'm after a sub caliber trainer.
Don't recollect which countries produced them, but there are OEM dummy rockets that conceal a single shot 9mm.
Sweden. The 9mm training round is a subsonic tracer (without the SG exception).
I would think that just getting a used tube would be cheaper than the training model -- you're going to have to reinvent the wheel with the firing mechanism anyway, and mechanically the trainers are crap.
Even if you got the appropriate DD permit, your DA would probably charge you under [whatever 12020(c)(9) turned into] as if it was a camouflaging firearm container. After all, they are OD green. Plus, it would be an operable shotgun concealed inside an inert milsurp novelty.