Richardson Industries R-5 12 gauge (S5877)

Richardson Industries R-5 12 gauge shotgun. Produced post WWII and is modeled after the slam fire guerilla gun dropped in the Philippines during WWII. Remove the barrel, insert a shell, past the barrel inwards until it rests against the trigger. Pull the trigger and slam the barrel rearward until the shell goes off. Very unusual and not many were made. Very good overall condition.