I am in possesion of an M-1 carbine S/N 5188394 made by Inland. My carbine has no rear sights but it has a muzzle supressor or flash arrestor The flash arrestor has sights and the weapon can be fired accurately by sighting down the top piece. It also has tangs for a bayonet on the flash arrestor My questions are as follows. 1. Was this weapon manufactured in this fashion if so why. 2. Can you tell me the year of manufacture by its serial number? 3. Is there something missing from the weapon? I remember the flash arrestor but I cannot remember if it had rear sights. The weapon seems not to have been modified so is there something missing. The weapon also has seen little use. If anyone can be of assistance in answering these questions I would be greatly apppreciative.