I'm with you, I have several on my vintage Crosmans and Benjamins. I think they are perfect for these old guns. Lightweight, rugged and reliable. Nothing fancy and inexpensive. I sometimes find them at gun shows for next to nothing. I have a couple more coming from ebay sellers as I type this.
This rifle is one of my favorite shooters. A Crosman 114 with a Weaver B4 clamped on with an old Crosman steel mount. Crude but very effective.