Originally Posted by doubleslover
The rear sight you have now is just the inside part of the S107 that is supposed to be there. It consisted of the metal mounting base, the inside sight piece that you have and a elevator bracket that slid up and down to raise or lower the sight. If you google Mossberg front sights and Mossberg rear sights, you will get 2 sites that show the various front and rear sights available back then. As mentioned, the sights are going for a high price on ebay right now. Around $50.00 for the front, 60-70 for the rear and 70-80 for the peep. Of course with any auction, it depends on the day.
i did think that rear was half of a 107 but whatever...those 1A or 101 front sight are pretty tough to find; i got lucky (and paid max $$$) when i saw one show up at auction...which is why i'm done picking up old mossbergs unless they have their original front and rear sights intact...i'm not into scoped rimfires at all...