I think I remember a commercially produced peep receiver sight intended for use on a 22 caliber rifle that has the grooved receiver. My Google-Foo is weak and I have not found any reference to it on today's internet. Does anyone have any info on such a peep sight that clamps on the groove? I have a Rem M 597 that would be just right for No. Nevada's Picket Pin Ground Squirrels and for some reason I want it to be equipped with a peep sight. .....

Williams still makes some.....not sure if it will fit the rifle you want to install it on though.

Williams FP-AG Receiver Peep Sight Air Guns 22 Rifles Dovetailed

And another brand and style from Brownells....

NECG RIMFIRE RECEIVER SIGHT | Brownells

Skinner also makes some:

RIMFIRE GROOVE SIGHTS

__________________
Ret. LE, FA Instr, S&W Armorer

Thanks, I will look over all those............