The pin in question here has a reduced diameter in the middle of the pin. It was used in conjunction with a lever that prevented the gun from fireing when the stock was in the folded position. Can't tell if those extra components are in this trunnion. Make sure they are not present. If they are, they will have to be removed as they might interfere with pin removal. Check this out remove if needed, and proceed with pin removal. Note. Never seen a 2 piece pin. Russians wouldn't do that.