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not sure who has williams sights here, but have you ever heard of "Skinner Sights"? These mount using the predrilled holes on top the reciever & Tim makes them in steel or brass & ships them anywhere in the world. http://skinnersights.com/
He is now also making a flip up reciever sight that is like a ladder sight with a peep that looks promising,...he is now experimenting & if he gets favorable feedback, may catalog them so to speak.....
check out this thread over at the marlin forum: http://www.marlinowners.com/forums/index.php/topic,25486.0.html
I will be contacting him shortly myself for a couple of them for my Marlins.
Williams will ship to Canada ph 1-800-530-9028 www.williamsgunsight.com ask for a catalog. I ordered a peep sight for a buffalo classic.They seemed ok to deal with. If this can help. AGE