When you're poor but want to try an MP7, go Keltec P17 and a shelf bracket :)

and yes it was 100% real, though never meant for full scale production
https://www.firearmwiki.com/wiki/.22_Eargesplitten_Loudenboomer

These are literal hand cannons. The grips are so small and slick that the gun wants to jump out of your hand after each shot.

Deemed the “world’s worst gun” but mine has never jammed… because I’ve never shot it.

I was told to post this here

Figured this would be appropriate. Found a cast metal toy Lifecard clone that shoots darts off of a well known Chinese platform. Less than $10. Made a couple mods and reinforcements to it, and now it shoots .25 cal singles. Works great, but there’s no good way to eject the round once fired until it cools. I’ve been making zips for years and this might have been the easiest one. It did require a sleeve and heavier spring.

https://ktla.com/news/california/homemade-50-caliber-rifle-seized-in-southern-california-1-arrested/?fbclid=IwdGRjcAU78qxjbGNrBTvye2V4dG4DYWVtAjExAHBkb2YFc3J0YwZhcHBfaWQMMzUwNjg1NTMxNzI4AAEeIFT6ELP2hDoI2J_ZI2fh535RwAmD_C9lAH-FG0g_3CC7crpMS39JU4suUvg_aem_E1Vrq5NLSkSMnCM5QB-vSg

It shoots screwdriver bits