I believe I have the same rifle, serial # 84180, it's the same as described except mine has two screws at the rear on the left hand side of the barrel extension just in front of the safe and extend out about 1/8 inch, apparently they attached something to the barrel i.e. the peep sight you talked about. The rifle is equipped with open rear sights and a blade front sight. Also there are two screws on top of the barrell extension on top of the bolt. I tried to look at the pics, yours are not there or a link but when I clicked on R. PRISM’S the picture a page comes up telling me I have to un lock it, which I do not have a clue. If need be I can send you a pic of mine. I am missing the stock and the magazine.
Thanks in advance.
Keep yer powder dry. GUNNER!!!
KEEP YOUR POWDER DRY, GUNNER!!!