Nice gun, and dates from 1975. The original stocks would have been like the Magnas in the photo. Not sure who the maker is of the target stocks but they are very attractive. I don't think they are Herretts. But if you like the way your hand fits with Magnas and a Tyler T, that's all that matters.

I have a Model 18-4. Many people say that the .22 WMR isn't as accurate as the .22 LR. That may well be at distances of 50+ yards out of a scoped rifle. But I'm pleased with regular 2" groups at 25 yards with several brands of ammo out of my Model 48-4.