I have a Marlin model 15yn that is not drilled or tapped, but has two grooves that run down either side of the receiver. I would like to put a cheap scope on it and I'm certain that these grooves are optics related, but I am unfamiliar with it as i have never owned optics. I do not want to drill it for sentimental reasons, so is there a mount for this type of receiver? Also, what kind of scope would you recommend? I'd like to spend under $50 total seeing as how its only like a $100 rifle to begin with. I'd post pictures, but my phone won't allow it since the website changed. Thanks ahead of time.