Trying to put a can on my gen 3 anyone got a link for an adapter that allows me to throw my multi caliber can on it ?

you need to make a drop in stock that loos like the Star Trek Jet Disc Tracer-Scope Toy Rifle - Vintage 1970's, Gold Color for the PR-3AT the front of the stock which is the magazie for the discs could hole extera stripper clips

It should be called the Short Homedefense Firearm adapther or PR-3AT SHF adapter