I've considered that option but am hoping to keep it "original". ThanksIf I remember correctly that model has a 3/8" dovetail on the top of the receiver.
You could add a scope like this-
rimfire riflescope Simmons .22 MAG
OUCH! Maybe a scope is in my futureHere is one on eBay
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Marlin / Glenfield Model 99 M1 Factory Rear Sight, 99M1 | eBay
Marlin / Glenfield Model 99 M1 Factory Rear Sight, 99M1.www.ebay.com
As per recommendation by Equalizer, below is a link to Sarco's website with search hits results for a search of "Rear Sights" (it kept truncating longer search strings I tried). There's several pages, so you may want to call them, but to can also looked through the results (or have better luck with your search strings than I did). Good Luck:On an outside chance. Call Sarco, located in Easton, PA
610-250-3960
Good luck
They have the base not the leaf. I think I just purchased the last complete sight in existence. But the guys who had mine actually have another one that is complete but taken apart. Outback Gunparts in Indiana. I gave $95 for mine but it's in excellent condition.You can probably find what you need in the link below for your Marlin.
It looks like they have the rear sight in-stock.
Marlin / Glenfield 99M1 | Numrich Gun Parts
Marlin / Glenfield Model 99M1 Semi-Auto Tube Fed. Shop current, OEM, obsolete and the rare hard-to-find gun parts and accessories for pistols, rifles, shotguns, long guns, and revolvers from the early musket days to today’s modern firearms (both U.S. and foreign). Numrich Gun Parts Corp. is the...www.gunpartscorp.com